2 #define I3__FILE__ "main.c"
4 * vim:ts=4:sw=4:expandtab
6 * i3 - an improved dynamic tiling window manager
7 * © 2009 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>
25 #include "sd-daemon.h"
27 /* The original value of RLIMIT_CORE when i3 was started. We need to restore
28 * this before starting any other process, since we set RLIMIT_CORE to
29 * RLIM_INFINITY for i3 debugging versions. */
30 struct rlimit original_rlimit_core;
32 /** The number of file descriptors passed via socket activation. */
35 /* We keep the xcb_check watcher around to be able to enable and disable it
36 * temporarily for drag_pointer(). */
37 static struct ev_check *xcb_check;
43 xcb_connection_t *conn;
44 /* The screen (0 when you are using DISPLAY=:0) of the connection 'conn' */
47 /* Display handle for libstartup-notification */
50 /* The last timestamp we got from X11 (timestamps are included in some events
51 * and are used for some things, like determining a unique ID in startup
53 xcb_timestamp_t last_timestamp = XCB_CURRENT_TIME;
55 xcb_screen_t *root_screen;
58 /* Color depth, visual id and colormap to use when creating windows and
59 * pixmaps. Will use 32 bit depth and an appropriate visual, if available,
60 * otherwise the root window’s default (usually 24 bit TrueColor). */
62 xcb_visualid_t visual_id;
63 xcb_colormap_t colormap;
65 struct ev_loop *main_loop;
67 xcb_key_symbols_t *keysyms;
69 /* Default shmlog size if not set by user. */
70 const int default_shmlog_size = 25 * 1024 * 1024;
72 /* The list of key bindings */
73 struct bindings_head *bindings;
75 /* The list of exec-lines */
76 struct autostarts_head autostarts = TAILQ_HEAD_INITIALIZER(autostarts);
78 /* The list of exec_always lines */
79 struct autostarts_always_head autostarts_always = TAILQ_HEAD_INITIALIZER(autostarts_always);
81 /* The list of assignments */
82 struct assignments_head assignments = TAILQ_HEAD_INITIALIZER(assignments);
84 /* The list of workspace assignments (which workspace should end up on which
86 struct ws_assignments_head ws_assignments = TAILQ_HEAD_INITIALIZER(ws_assignments);
88 /* We hope that those are supported and set them to true */
89 bool xcursor_supported = true;
90 bool xkb_supported = true;
93 * This callback is only a dummy, see xcb_prepare_cb and xcb_check_cb.
94 * See also man libev(3): "ev_prepare" and "ev_check" - customise your event loop
97 static void xcb_got_event(EV_P_ struct ev_io *w, int revents) {
98 /* empty, because xcb_prepare_cb and xcb_check_cb are used */
102 * Flush before blocking (and waiting for new events)
105 static void xcb_prepare_cb(EV_P_ ev_prepare *w, int revents) {
110 * Instead of polling the X connection socket we leave this to
111 * xcb_poll_for_event() which knows better than we can ever know.
114 static void xcb_check_cb(EV_P_ ev_check *w, int revents) {
115 xcb_generic_event_t *event;
117 while ((event = xcb_poll_for_event(conn)) != NULL) {
118 if (event->response_type == 0) {
119 if (event_is_ignored(event->sequence, 0))
120 DLOG("Expected X11 Error received for sequence %x\n", event->sequence);
122 xcb_generic_error_t *error = (xcb_generic_error_t *)event;
123 DLOG("X11 Error received (probably harmless)! sequence 0x%x, error_code = %d\n",
124 error->sequence, error->error_code);
130 /* Strip off the highest bit (set if the event is generated) */
131 int type = (event->response_type & 0x7F);
133 handle_event(type, event);
140 * Enable or disable the main X11 event handling function.
141 * This is used by drag_pointer() which has its own, modal event handler, which
142 * takes precedence over the normal event handler.
145 void main_set_x11_cb(bool enable) {
146 DLOG("Setting main X11 callback to enabled=%d\n", enable);
148 ev_check_start(main_loop, xcb_check);
149 /* Trigger the watcher explicitly to handle all remaining X11 events.
150 * drag_pointer()’s event handler exits in the middle of the loop. */
151 ev_feed_event(main_loop, xcb_check, 0);
153 ev_check_stop(main_loop, xcb_check);
158 * Exit handler which destroys the main_loop. Will trigger cleanup handlers.
161 static void i3_exit(void) {
162 /* We need ev >= 4 for the following code. Since it is not *that* important (it
163 * only makes sure that there are no i3-nagbar instances left behind) we still
164 * support old systems with libev 3. */
165 #if EV_VERSION_MAJOR >= 4
166 ev_loop_destroy(main_loop);
169 if (*shmlogname != '\0') {
170 fprintf(stderr, "Closing SHM log \"%s\"\n", shmlogname);
172 shm_unlink(shmlogname);
177 * (One-shot) Handler for all signals with default action "Term", see signal(7)
179 * Unlinks the SHM log and re-raises the signal.
182 static void handle_signal(int sig, siginfo_t *info, void *data) {
183 if (*shmlogname != '\0') {
184 shm_unlink(shmlogname);
189 int main(int argc, char *argv[]) {
190 /* Keep a symbol pointing to the I3_VERSION string constant so that we have
191 * it in gdb backtraces. */
192 const char *_i3_version __attribute__((unused)) = i3_version;
193 char *override_configpath = NULL;
194 bool autostart = true;
195 char *layout_path = NULL;
196 bool delete_layout_path = false;
197 bool force_xinerama = false;
198 char *fake_outputs = NULL;
199 bool disable_signalhandler = false;
200 bool only_check_config = false;
201 static struct option long_options[] = {
202 {"no-autostart", no_argument, 0, 'a'},
203 {"config", required_argument, 0, 'c'},
204 {"version", no_argument, 0, 'v'},
205 {"moreversion", no_argument, 0, 'm'},
206 {"more-version", no_argument, 0, 'm'},
207 {"more_version", no_argument, 0, 'm'},
208 {"help", no_argument, 0, 'h'},
209 {"layout", required_argument, 0, 'L'},
210 {"restart", required_argument, 0, 0},
211 {"force-xinerama", no_argument, 0, 0},
212 {"force_xinerama", no_argument, 0, 0},
213 {"disable-signalhandler", no_argument, 0, 0},
214 {"shmlog-size", required_argument, 0, 0},
215 {"shmlog_size", required_argument, 0, 0},
216 {"get-socketpath", no_argument, 0, 0},
217 {"get_socketpath", no_argument, 0, 0},
218 {"fake_outputs", required_argument, 0, 0},
219 {"fake-outputs", required_argument, 0, 0},
220 {"force-old-config-parser-v4.4-only", no_argument, 0, 0},
222 int option_index = 0, opt;
224 setlocale(LC_ALL, "");
226 /* Get the RLIMIT_CORE limit at startup time to restore this before
227 * starting processes. */
228 getrlimit(RLIMIT_CORE, &original_rlimit_core);
230 /* Disable output buffering to make redirects in .xsession actually useful for debugging */
231 if (!isatty(fileno(stdout)))
232 setbuf(stdout, NULL);
236 /* Init logging *before* initializing debug_build to guarantee early
240 /* On release builds, disable SHM logging by default. */
241 shmlog_size = (is_debug_build() || strstr(argv[0], "i3-with-shmlog") != NULL ? default_shmlog_size : 0);
245 while ((opt = getopt_long(argc, argv, "c:CvmaL:hld:V", long_options, &option_index)) != -1) {
248 LOG("Autostart disabled using -a\n");
253 layout_path = sstrdup(optarg);
254 delete_layout_path = false;
257 FREE(override_configpath);
258 override_configpath = sstrdup(optarg);
261 LOG("Checking configuration file only (-C)\n");
262 only_check_config = true;
265 printf("i3 version %s © 2009 Michael Stapelberg and contributors\n", i3_version);
269 printf("Binary i3 version: %s © 2009 Michael Stapelberg and contributors\n", i3_version);
270 display_running_version();
277 LOG("Enabling debug logging\n");
278 set_debug_logging(true);
281 /* DEPRECATED, ignored for the next 3 versions (3.e, 3.f, 3.g) */
284 if (strcmp(long_options[option_index].name, "force-xinerama") == 0 ||
285 strcmp(long_options[option_index].name, "force_xinerama") == 0) {
286 force_xinerama = true;
287 ELOG("Using Xinerama instead of RandR. This option should be "
288 "avoided at all cost because it does not refresh the list "
289 "of screens, so you cannot configure displays at runtime. "
290 "Please check if your driver really does not support RandR "
291 "and disable this option as soon as you can.\n");
293 } else if (strcmp(long_options[option_index].name, "disable-signalhandler") == 0) {
294 disable_signalhandler = true;
296 } else if (strcmp(long_options[option_index].name, "get-socketpath") == 0 ||
297 strcmp(long_options[option_index].name, "get_socketpath") == 0) {
298 char *socket_path = root_atom_contents("I3_SOCKET_PATH", NULL, 0);
300 printf("%s\n", socket_path);
305 } else if (strcmp(long_options[option_index].name, "shmlog-size") == 0 ||
306 strcmp(long_options[option_index].name, "shmlog_size") == 0) {
307 shmlog_size = atoi(optarg);
308 /* Re-initialize logging immediately to get as many
309 * logmessages as possible into the SHM log. */
311 LOG("Limiting SHM log size to %d bytes\n", shmlog_size);
313 } else if (strcmp(long_options[option_index].name, "restart") == 0) {
315 layout_path = sstrdup(optarg);
316 delete_layout_path = true;
318 } else if (strcmp(long_options[option_index].name, "fake-outputs") == 0 ||
319 strcmp(long_options[option_index].name, "fake_outputs") == 0) {
320 LOG("Initializing fake outputs: %s\n", optarg);
321 fake_outputs = sstrdup(optarg);
323 } else if (strcmp(long_options[option_index].name, "force-old-config-parser-v4.4-only") == 0) {
324 ELOG("You are passing --force-old-config-parser-v4.4-only, but that flag was removed by now.\n");
329 fprintf(stderr, "Usage: %s [-c configfile] [-d all] [-a] [-v] [-V] [-C]\n", argv[0]);
330 fprintf(stderr, "\n");
331 fprintf(stderr, "\t-a disable autostart ('exec' lines in config)\n");
332 fprintf(stderr, "\t-c <file> use the provided configfile instead\n");
333 fprintf(stderr, "\t-C validate configuration file and exit\n");
334 fprintf(stderr, "\t-d all enable debug output\n");
335 fprintf(stderr, "\t-L <file> path to the serialized layout during restarts\n");
336 fprintf(stderr, "\t-v display version and exit\n");
337 fprintf(stderr, "\t-V enable verbose mode\n");
338 fprintf(stderr, "\n");
339 fprintf(stderr, "\t--force-xinerama\n"
340 "\tUse Xinerama instead of RandR.\n"
341 "\tThis option should only be used if you are stuck with the\n"
342 "\told nVidia closed source driver (older than 302.17), which does\n"
343 "\tnot support RandR.\n");
344 fprintf(stderr, "\n");
345 fprintf(stderr, "\t--get-socketpath\n"
346 "\tRetrieve the i3 IPC socket path from X11, print it, then exit.\n");
347 fprintf(stderr, "\n");
348 fprintf(stderr, "\t--shmlog-size <limit>\n"
349 "\tLimits the size of the i3 SHM log to <limit> bytes. Setting this\n"
350 "\tto 0 disables SHM logging entirely.\n"
351 "\tThe default is %d bytes.\n",
353 fprintf(stderr, "\n");
354 fprintf(stderr, "If you pass plain text arguments, i3 will interpret them as a command\n"
355 "to send to a currently running i3 (like i3-msg). This allows you to\n"
356 "use nice and logical commands, such as:\n"
359 "\ti3 floating toggle\n"
366 if (only_check_config) {
367 exit(parse_configuration(override_configpath, false) ? 0 : 1);
370 /* If the user passes more arguments, we act like i3-msg would: Just send
371 * the arguments as an IPC message to i3. This allows for nice semantic
372 * commands such as 'i3 border none'. */
374 /* We enable verbose mode so that the user knows what’s going on.
375 * This should make it easier to find mistakes when the user passes
376 * arguments by mistake. */
379 LOG("Additional arguments passed. Sending them as a command to i3.\n");
380 char *payload = NULL;
381 while (optind < argc) {
383 payload = sstrdup(argv[optind]);
386 sasprintf(&both, "%s %s", payload, argv[optind]);
392 DLOG("Command is: %s (%zd bytes)\n", payload, strlen(payload));
393 char *socket_path = root_atom_contents("I3_SOCKET_PATH", NULL, 0);
395 ELOG("Could not get i3 IPC socket path\n");
399 int sockfd = socket(AF_LOCAL, SOCK_STREAM, 0);
401 err(EXIT_FAILURE, "Could not create socket");
403 struct sockaddr_un addr;
404 memset(&addr, 0, sizeof(struct sockaddr_un));
405 addr.sun_family = AF_LOCAL;
406 strncpy(addr.sun_path, socket_path, sizeof(addr.sun_path) - 1);
407 if (connect(sockfd, (const struct sockaddr *)&addr, sizeof(struct sockaddr_un)) < 0)
408 err(EXIT_FAILURE, "Could not connect to i3");
410 if (ipc_send_message(sockfd, strlen(payload), I3_IPC_MESSAGE_TYPE_COMMAND,
411 (uint8_t *)payload) == -1)
412 err(EXIT_FAILURE, "IPC: write()");
414 uint32_t reply_length;
418 if ((ret = ipc_recv_message(sockfd, &reply_type, &reply_length, &reply)) != 0) {
420 err(EXIT_FAILURE, "IPC: read()");
423 if (reply_type != I3_IPC_MESSAGE_TYPE_COMMAND)
424 errx(EXIT_FAILURE, "IPC: received reply of type %d but expected %d (COMMAND)", reply_type, I3_IPC_MESSAGE_TYPE_COMMAND);
425 printf("%.*s\n", reply_length, reply);
429 /* Enable logging to handle the case when the user did not specify --shmlog-size */
432 /* Try to enable core dumps by default when running a debug build */
433 if (is_debug_build()) {
434 struct rlimit limit = {RLIM_INFINITY, RLIM_INFINITY};
435 setrlimit(RLIMIT_CORE, &limit);
437 /* The following code is helpful, but not required. We thus don’t pay
438 * much attention to error handling, non-linux or other edge cases. */
439 LOG("CORE DUMPS: You are running a development version of i3, so coredumps were automatically enabled (ulimit -c unlimited).\n");
440 size_t cwd_size = 1024;
441 char *cwd = smalloc(cwd_size);
443 while ((cwd_ret = getcwd(cwd, cwd_size)) == NULL && errno == ERANGE) {
444 cwd_size = cwd_size * 2;
445 cwd = srealloc(cwd, cwd_size);
448 LOG("CORE DUMPS: Your current working directory is \"%s\".\n", cwd);
450 if ((patternfd = open("/proc/sys/kernel/core_pattern", O_RDONLY)) >= 0) {
451 memset(cwd, '\0', cwd_size);
452 if (read(patternfd, cwd, cwd_size) > 0)
453 /* a trailing newline is included in cwd */
454 LOG("CORE DUMPS: Your core_pattern is: \"%s\".\n", cwd);
460 LOG("i3 %s starting\n", i3_version);
462 conn = xcb_connect(NULL, &conn_screen);
463 if (xcb_connection_has_error(conn))
464 errx(EXIT_FAILURE, "Cannot open display\n");
466 sndisplay = sn_xcb_display_new(conn, NULL, NULL);
468 /* Initialize the libev event loop. This needs to be done before loading
469 * the config file because the parser will install an ev_child watcher
470 * for the nagbar when config errors are found. */
471 main_loop = EV_DEFAULT;
472 if (main_loop == NULL)
473 die("Could not initialize libev. Bad LIBEV_FLAGS?\n");
475 root_screen = xcb_aux_get_screen(conn, conn_screen);
476 root = root_screen->root;
478 /* Place requests for the atoms we need as soon as possible */
479 #define xmacro(atom) \
480 xcb_intern_atom_cookie_t atom##_cookie = xcb_intern_atom(conn, 0, strlen(#atom), #atom);
481 #include "atoms.xmacro"
484 /* By default, we use the same depth and visual as the root window, which
485 * usually is TrueColor (24 bit depth) and the corresponding visual.
486 * However, we also check if a 32 bit depth and visual are available (for
487 * transparency) and use it if so. */
488 root_depth = root_screen->root_depth;
489 visual_id = root_screen->root_visual;
490 colormap = root_screen->default_colormap;
492 DLOG("root_depth = %d, visual_id = 0x%08x.\n", root_depth, visual_id);
493 DLOG("root_screen->height_in_pixels = %d, root_screen->height_in_millimeters = %d, dpi = %d\n",
494 root_screen->height_in_pixels, root_screen->height_in_millimeters,
495 (int)((double)root_screen->height_in_pixels * 25.4 / (double)root_screen->height_in_millimeters));
496 DLOG("One logical pixel corresponds to %d physical pixels on this display.\n", logical_px(1));
498 xcb_get_geometry_cookie_t gcookie = xcb_get_geometry(conn, root);
499 xcb_query_pointer_cookie_t pointercookie = xcb_query_pointer(conn, root);
501 /* Setup NetWM atoms */
502 #define xmacro(name) \
504 xcb_intern_atom_reply_t *reply = xcb_intern_atom_reply(conn, name##_cookie, NULL); \
506 ELOG("Could not get atom " #name "\n"); \
509 A_##name = reply->atom; \
512 #include "atoms.xmacro"
515 load_configuration(conn, override_configpath, false);
517 if (config.ipc_socket_path == NULL) {
518 /* Fall back to a file name in /tmp/ based on the PID */
519 if ((config.ipc_socket_path = getenv("I3SOCK")) == NULL)
520 config.ipc_socket_path = get_process_filename("ipc-socket");
522 config.ipc_socket_path = sstrdup(config.ipc_socket_path);
525 xcb_void_cookie_t cookie;
526 cookie = xcb_change_window_attributes_checked(conn, root, XCB_CW_EVENT_MASK, (uint32_t[]){ROOT_EVENT_MASK});
527 check_error(conn, cookie, "Another window manager seems to be running");
529 xcb_get_geometry_reply_t *greply = xcb_get_geometry_reply(conn, gcookie, NULL);
530 if (greply == NULL) {
531 ELOG("Could not get geometry of the root window, exiting\n");
534 DLOG("root geometry reply: (%d, %d) %d x %d\n", greply->x, greply->y, greply->width, greply->height);
536 xcursor_load_cursors();
538 /* Set a cursor for the root window (otherwise the root window will show no
539 cursor until the first client is launched). */
540 if (xcursor_supported)
541 xcursor_set_root_cursor(XCURSOR_CURSOR_POINTER);
543 xcb_set_root_cursor(XCURSOR_CURSOR_POINTER);
545 const xcb_query_extension_reply_t *extreply;
546 extreply = xcb_get_extension_data(conn, &xcb_xkb_id);
547 xkb_supported = extreply->present;
548 if (!extreply->present) {
549 DLOG("xkb is not present on this server\n");
551 DLOG("initializing xcb-xkb\n");
552 xcb_xkb_use_extension(conn, XCB_XKB_MAJOR_VERSION, XCB_XKB_MINOR_VERSION);
553 xcb_xkb_select_events(conn,
554 XCB_XKB_ID_USE_CORE_KBD,
555 XCB_XKB_EVENT_TYPE_STATE_NOTIFY | XCB_XKB_EVENT_TYPE_MAP_NOTIFY | XCB_XKB_EVENT_TYPE_NEW_KEYBOARD_NOTIFY,
557 XCB_XKB_EVENT_TYPE_STATE_NOTIFY | XCB_XKB_EVENT_TYPE_MAP_NOTIFY | XCB_XKB_EVENT_TYPE_NEW_KEYBOARD_NOTIFY,
562 /* Setting both, XCB_XKB_PER_CLIENT_FLAG_GRABS_USE_XKB_STATE and
563 * XCB_XKB_PER_CLIENT_FLAG_LOOKUP_STATE_WHEN_GRABBED, will lead to the
564 * X server sending us the full XKB state in KeyPress and KeyRelease:
565 * https://sources.debian.net/src/xorg-server/2:1.17.2-1.1/xkb/xkbEvents.c/?hl=927#L927
567 xcb_xkb_per_client_flags_reply_t *pcf_reply;
568 /* The last three parameters are unset because they are only relevant
569 * when using a feature called “automatic reset of boolean controls”:
570 * http://www.x.org/releases/X11R7.7/doc/kbproto/xkbproto.html#Automatic_Reset_of_Boolean_Controls
572 pcf_reply = xcb_xkb_per_client_flags_reply(
574 xcb_xkb_per_client_flags(
576 XCB_XKB_ID_USE_CORE_KBD,
577 XCB_XKB_PER_CLIENT_FLAG_GRABS_USE_XKB_STATE | XCB_XKB_PER_CLIENT_FLAG_LOOKUP_STATE_WHEN_GRABBED,
578 XCB_XKB_PER_CLIENT_FLAG_GRABS_USE_XKB_STATE | XCB_XKB_PER_CLIENT_FLAG_LOOKUP_STATE_WHEN_GRABBED,
579 0 /* uint32_t ctrlsToChange */,
580 0 /* uint32_t autoCtrls */,
581 0 /* uint32_t autoCtrlsValues */),
583 if (pcf_reply == NULL ||
584 !(pcf_reply->value & XCB_XKB_PER_CLIENT_FLAG_GRABS_USE_XKB_STATE)) {
585 ELOG("Could not set XCB_XKB_PER_CLIENT_FLAG_GRABS_USE_XKB_STATE\n");
587 if (pcf_reply == NULL ||
588 !(pcf_reply->value & XCB_XKB_PER_CLIENT_FLAG_LOOKUP_STATE_WHEN_GRABBED)) {
589 ELOG("Could not set XCB_XKB_PER_CLIENT_FLAG_LOOKUP_STATE_WHEN_GRABBED\n");
592 xkb_base = extreply->first_event;
597 property_handlers_init();
601 keysyms = xcb_key_symbols_alloc(conn);
603 xcb_numlock_mask = aio_get_mod_mask_for(XCB_NUM_LOCK, keysyms);
606 die("Could not load keymap\n");
611 bool needs_tree_init = true;
613 LOG("Trying to restore the layout from \"%s\".\n", layout_path);
614 needs_tree_init = !tree_restore(layout_path, greply);
615 if (delete_layout_path) {
617 const char *dir = dirname(layout_path);
618 /* possibly fails with ENOTEMPTY if there are files (or
629 /* Setup fake outputs for testing */
630 if (fake_outputs == NULL && config.fake_outputs != NULL)
631 fake_outputs = config.fake_outputs;
633 if (fake_outputs != NULL) {
634 fake_outputs_init(fake_outputs);
636 config.fake_outputs = NULL;
637 } else if (force_xinerama || config.force_xinerama) {
638 /* Force Xinerama (for drivers which don't support RandR yet, esp. the
639 * nVidia binary graphics driver), when specified either in the config
640 * file or on command-line */
643 DLOG("Checking for XRandR...\n");
644 randr_init(&randr_base);
647 scratchpad_fix_resolution();
649 xcb_query_pointer_reply_t *pointerreply;
650 Output *output = NULL;
651 if (!(pointerreply = xcb_query_pointer_reply(conn, pointercookie, NULL))) {
652 ELOG("Could not query pointer position, using first screen\n");
654 DLOG("Pointer at %d, %d\n", pointerreply->root_x, pointerreply->root_y);
655 output = get_output_containing(pointerreply->root_x, pointerreply->root_y);
657 ELOG("ERROR: No screen at (%d, %d), starting on the first screen\n",
658 pointerreply->root_x, pointerreply->root_y);
659 output = get_first_output();
662 con_focus(con_descend_focused(output_get_content(output->con)));
667 /* Create the UNIX domain socket for IPC */
668 int ipc_socket = ipc_create_socket(config.ipc_socket_path);
669 if (ipc_socket == -1) {
670 ELOG("Could not create the IPC socket, IPC disabled\n");
672 struct ev_io *ipc_io = scalloc(1, sizeof(struct ev_io));
673 ev_io_init(ipc_io, ipc_new_client, ipc_socket, EV_READ);
674 ev_io_start(main_loop, ipc_io);
677 /* Also handle the UNIX domain sockets passed via socket activation. The
678 * parameter 1 means "remove the environment variables", we don’t want to
679 * pass these to child processes. */
680 listen_fds = sd_listen_fds(0);
682 ELOG("socket activation: Error in sd_listen_fds\n");
683 else if (listen_fds == 0)
684 DLOG("socket activation: no sockets passed\n");
687 for (int fd = SD_LISTEN_FDS_START;
688 fd < (SD_LISTEN_FDS_START + listen_fds);
690 DLOG("socket activation: also listening on fd %d\n", fd);
692 /* sd_listen_fds() enables FD_CLOEXEC by default.
693 * However, we need to keep the file descriptors open for in-place
694 * restarting, therefore we explicitly disable FD_CLOEXEC. */
695 if ((flags = fcntl(fd, F_GETFD)) < 0 ||
696 fcntl(fd, F_SETFD, flags & ~FD_CLOEXEC) < 0) {
697 ELOG("Could not disable FD_CLOEXEC on fd %d\n", fd);
700 struct ev_io *ipc_io = scalloc(1, sizeof(struct ev_io));
701 ev_io_init(ipc_io, ipc_new_client, fd, EV_READ);
702 ev_io_start(main_loop, ipc_io);
706 /* Set up i3 specific atoms like I3_SOCKET_PATH and I3_CONFIG_PATH */
708 ewmh_update_workarea();
710 /* Set the ewmh desktop properties. */
711 ewmh_update_current_desktop();
712 ewmh_update_number_of_desktops();
713 ewmh_update_desktop_names();
714 ewmh_update_desktop_viewport();
716 struct ev_io *xcb_watcher = scalloc(1, sizeof(struct ev_io));
717 xcb_check = scalloc(1, sizeof(struct ev_check));
718 struct ev_prepare *xcb_prepare = scalloc(1, sizeof(struct ev_prepare));
720 ev_io_init(xcb_watcher, xcb_got_event, xcb_get_file_descriptor(conn), EV_READ);
721 ev_io_start(main_loop, xcb_watcher);
723 ev_check_init(xcb_check, xcb_check_cb);
724 ev_check_start(main_loop, xcb_check);
726 ev_prepare_init(xcb_prepare, xcb_prepare_cb);
727 ev_prepare_start(main_loop, xcb_prepare);
731 /* What follows is a fugly consequence of X11 protocol race conditions like
732 * the following: In an i3 in-place restart, i3 will reparent all windows
733 * to the root window, then exec() itself. In the new process, it calls
734 * manage_existing_windows. However, in case any application sent a
735 * generated UnmapNotify message to the WM (as GIMP does), this message
736 * will be handled by i3 *after* managing the window, thus i3 thinks the
737 * window just closed itself. In reality, the message was sent in the time
738 * period where i3 wasn’t running yet.
740 * To prevent this, we grab the server (disables processing of any other
741 * connections), then discard all pending events (since we didn’t do
742 * anything, there cannot be any meaningful responses), then ungrab the
744 xcb_grab_server(conn);
747 xcb_generic_event_t *event;
748 while ((event = xcb_poll_for_event(conn)) != NULL) {
749 if (event->response_type == 0) {
754 /* Strip off the highest bit (set if the event is generated) */
755 int type = (event->response_type & 0x7F);
757 /* We still need to handle MapRequests which are sent in the
758 * timespan starting from when we register as a window manager and
759 * this piece of code which drops events. */
760 if (type == XCB_MAP_REQUEST)
761 handle_event(type, event);
765 manage_existing_windows(root);
767 xcb_ungrab_server(conn);
770 LOG("This is not an in-place restart, copying root window contents to a pixmap\n");
771 xcb_screen_t *root = xcb_aux_get_screen(conn, conn_screen);
772 uint16_t width = root->width_in_pixels;
773 uint16_t height = root->height_in_pixels;
774 xcb_pixmap_t pixmap = xcb_generate_id(conn);
775 xcb_gcontext_t gc = xcb_generate_id(conn);
777 xcb_create_pixmap(conn, root->root_depth, pixmap, root->root, width, height);
779 xcb_create_gc(conn, gc, root->root,
780 XCB_GC_FUNCTION | XCB_GC_PLANE_MASK | XCB_GC_FILL_STYLE | XCB_GC_SUBWINDOW_MODE,
781 (uint32_t[]){XCB_GX_COPY, ~0, XCB_FILL_STYLE_SOLID, XCB_SUBWINDOW_MODE_INCLUDE_INFERIORS});
783 xcb_copy_area(conn, root->root, pixmap, gc, 0, 0, 0, 0, width, height);
784 xcb_change_window_attributes_checked(conn, root->root, XCB_CW_BACK_PIXMAP, (uint32_t[]){pixmap});
786 xcb_free_gc(conn, gc);
787 xcb_free_pixmap(conn, pixmap);
790 struct sigaction action;
792 action.sa_sigaction = handle_signal;
793 action.sa_flags = SA_NODEFER | SA_RESETHAND | SA_SIGINFO;
794 sigemptyset(&action.sa_mask);
796 if (!disable_signalhandler)
797 setup_signal_handler();
799 /* Catch all signals with default action "Core", see signal(7) */
800 if (sigaction(SIGQUIT, &action, NULL) == -1 ||
801 sigaction(SIGILL, &action, NULL) == -1 ||
802 sigaction(SIGABRT, &action, NULL) == -1 ||
803 sigaction(SIGFPE, &action, NULL) == -1 ||
804 sigaction(SIGSEGV, &action, NULL) == -1)
805 ELOG("Could not setup signal handler.\n");
808 /* Catch all signals with default action "Term", see signal(7) */
809 if (sigaction(SIGHUP, &action, NULL) == -1 ||
810 sigaction(SIGINT, &action, NULL) == -1 ||
811 sigaction(SIGALRM, &action, NULL) == -1 ||
812 sigaction(SIGUSR1, &action, NULL) == -1 ||
813 sigaction(SIGUSR2, &action, NULL) == -1)
814 ELOG("Could not setup signal handler.\n");
816 /* Ignore SIGPIPE to survive errors when an IPC client disconnects
817 * while we are sending them a message */
818 signal(SIGPIPE, SIG_IGN);
820 /* Autostarting exec-lines */
822 while (!TAILQ_EMPTY(&autostarts)) {
823 struct Autostart *exec = TAILQ_FIRST(&autostarts);
825 LOG("auto-starting %s\n", exec->command);
826 start_application(exec->command, exec->no_startup_id);
829 TAILQ_REMOVE(&autostarts, exec, autostarts);
834 /* Autostarting exec_always-lines */
835 while (!TAILQ_EMPTY(&autostarts_always)) {
836 struct Autostart *exec_always = TAILQ_FIRST(&autostarts_always);
838 LOG("auto-starting (always!) %s\n", exec_always->command);
839 start_application(exec_always->command, exec_always->no_startup_id);
841 FREE(exec_always->command);
842 TAILQ_REMOVE(&autostarts_always, exec_always, autostarts_always);
846 /* Start i3bar processes for all configured bars */
847 Barconfig *barconfig;
848 TAILQ_FOREACH(barconfig, &barconfigs, configs) {
849 char *command = NULL;
850 sasprintf(&command, "%s --bar_id=%s --socket=\"%s\"",
851 barconfig->i3bar_command ? barconfig->i3bar_command : "i3bar",
852 barconfig->id, current_socketpath);
853 LOG("Starting bar process: %s\n", command);
854 start_application(command, true);
858 /* Make sure to destroy the event loop to invoke the cleeanup callbacks
859 * when calling exit() */
862 ev_loop(main_loop, 0);