#undef I3__FILE__ #define I3__FILE__ "main.c" /* * vim:ts=4:sw=4:expandtab * * i3 - an improved dynamic tiling window manager * © 2009-2012 Michael Stapelberg and contributors (see also: LICENSE) * * main.c: Initialization, main loop * */ #include #include #include #include #include #include #include #include #include #include "all.h" #include "sd-daemon.h" /* The original value of RLIMIT_CORE when i3 was started. We need to restore * this before starting any other process, since we set RLIMIT_CORE to * RLIM_INFINITY for i3 debugging versions. */ struct rlimit original_rlimit_core; /** The number of file descriptors passed via socket activation. */ int listen_fds; static int xkb_event_base; int xkb_current_group; extern Con *focused; char **start_argv; xcb_connection_t *conn; /* The screen (0 when you are using DISPLAY=:0) of the connection 'conn' */ int conn_screen; /* Display handle for libstartup-notification */ SnDisplay *sndisplay; /* The last timestamp we got from X11 (timestamps are included in some events * and are used for some things, like determining a unique ID in startup * notification). */ xcb_timestamp_t last_timestamp = XCB_CURRENT_TIME; xcb_screen_t *root_screen; xcb_window_t root; /* Color depth, visual id and colormap to use when creating windows and * pixmaps. Will use 32 bit depth and an appropriate visual, if available, * otherwise the root window’s default (usually 24 bit TrueColor). */ uint8_t root_depth; xcb_visualid_t visual_id; xcb_colormap_t colormap; struct ev_loop *main_loop; xcb_key_symbols_t *keysyms; /* Those are our connections to X11 for use with libXcursor and XKB */ Display *xlibdpy, *xkbdpy; /* The list of key bindings */ struct bindings_head *bindings; /* The list of exec-lines */ struct autostarts_head autostarts = TAILQ_HEAD_INITIALIZER(autostarts); /* The list of exec_always lines */ struct autostarts_always_head autostarts_always = TAILQ_HEAD_INITIALIZER(autostarts_always); /* The list of assignments */ struct assignments_head assignments = TAILQ_HEAD_INITIALIZER(assignments); /* The list of workspace assignments (which workspace should end up on which * output) */ struct ws_assignments_head ws_assignments = TAILQ_HEAD_INITIALIZER(ws_assignments); /* We hope that those are supported and set them to true */ bool xcursor_supported = true; bool xkb_supported = true; /* This will be set to true when -C is used so that functions can behave * slightly differently. We don’t want i3-nagbar to be started when validating * the config, for example. */ bool only_check_config = false; /* * This callback is only a dummy, see xcb_prepare_cb and xcb_check_cb. * See also man libev(3): "ev_prepare" and "ev_check" - customise your event loop * */ static void xcb_got_event(EV_P_ struct ev_io *w, int revents) { /* empty, because xcb_prepare_cb and xcb_check_cb are used */ } /* * Flush before blocking (and waiting for new events) * */ static void xcb_prepare_cb(EV_P_ ev_prepare *w, int revents) { xcb_flush(conn); } /* * Instead of polling the X connection socket we leave this to * xcb_poll_for_event() which knows better than we can ever know. * */ static void xcb_check_cb(EV_P_ ev_check *w, int revents) { xcb_generic_event_t *event; while ((event = xcb_poll_for_event(conn)) != NULL) { if (event->response_type == 0) { if (event_is_ignored(event->sequence, 0)) DLOG("Expected X11 Error received for sequence %x\n", event->sequence); else { xcb_generic_error_t *error = (xcb_generic_error_t*)event; DLOG("X11 Error received (probably harmless)! sequence 0x%x, error_code = %d\n", error->sequence, error->error_code); } free(event); continue; } /* Strip off the highest bit (set if the event is generated) */ int type = (event->response_type & 0x7F); handle_event(type, event); free(event); } } /* * When using xmodmap to change the keyboard mapping, this event * is only sent via XKB. Therefore, we need this special handler. * */ static void xkb_got_event(EV_P_ struct ev_io *w, int revents) { DLOG("Handling XKB event\n"); XkbEvent ev; /* When using xmodmap, every change (!) gets an own event. * Therefore, we just read all events and only handle the * mapping_notify once. */ bool mapping_changed = false; while (XPending(xkbdpy)) { XNextEvent(xkbdpy, (XEvent*)&ev); /* While we should never receive a non-XKB event, * better do sanity checking */ if (ev.type != xkb_event_base) continue; if (ev.any.xkb_type == XkbMapNotify) { mapping_changed = true; continue; } if (ev.any.xkb_type != XkbStateNotify) { ELOG("Unknown XKB event received (type %d)\n", ev.any.xkb_type); continue; } /* See The XKB Extension: Library Specification, section 14.1 */ /* We check if the current group (each group contains * two levels) has been changed. Mode_switch activates * group XkbGroup2Index */ if (xkb_current_group == ev.state.group) continue; xkb_current_group = ev.state.group; if (ev.state.group == XkbGroup2Index) { DLOG("Mode_switch enabled\n"); grab_all_keys(conn, true); } if (ev.state.group == XkbGroup1Index) { DLOG("Mode_switch disabled\n"); ungrab_all_keys(conn); grab_all_keys(conn, false); } } if (!mapping_changed) return; DLOG("Keyboard mapping changed, updating keybindings\n"); xcb_key_symbols_free(keysyms); keysyms = xcb_key_symbols_alloc(conn); xcb_numlock_mask = aio_get_mod_mask_for(XCB_NUM_LOCK, keysyms); ungrab_all_keys(conn); DLOG("Re-grabbing...\n"); translate_keysyms(); grab_all_keys(conn, (xkb_current_group == XkbGroup2Index)); DLOG("Done\n"); } /* * Exit handler which destroys the main_loop. Will trigger cleanup handlers. * */ static void i3_exit(void) { /* We need ev >= 4 for the following code. Since it is not *that* important (it * only makes sure that there are no i3-nagbar instances left behind) we still * support old systems with libev 3. */ #if EV_VERSION_MAJOR >= 4 ev_loop_destroy(main_loop); #endif if (*shmlogname != '\0') { fprintf(stderr, "Closing SHM log \"%s\"\n", shmlogname); fflush(stderr); shm_unlink(shmlogname); } } /* * (One-shot) Handler for all signals with default action "Term", see signal(7) * * Unlinks the SHM log and re-raises the signal. * */ static void handle_signal(int sig, siginfo_t *info, void *data) { if (*shmlogname != '\0') { shm_unlink(shmlogname); } raise(sig); } int main(int argc, char *argv[]) { /* Keep a symbol pointing to the I3_VERSION string constant so that we have * it in gdb backtraces. */ const char *i3_version __attribute__ ((unused)) = I3_VERSION; char *override_configpath = NULL; bool autostart = true; char *layout_path = NULL; bool delete_layout_path = false; bool force_xinerama = false; char *fake_outputs = NULL; bool disable_signalhandler = false; static struct option long_options[] = { {"no-autostart", no_argument, 0, 'a'}, {"config", required_argument, 0, 'c'}, {"version", no_argument, 0, 'v'}, {"moreversion", no_argument, 0, 'm'}, {"more-version", no_argument, 0, 'm'}, {"more_version", no_argument, 0, 'm'}, {"help", no_argument, 0, 'h'}, {"layout", required_argument, 0, 'L'}, {"restart", required_argument, 0, 0}, {"force-xinerama", no_argument, 0, 0}, {"force_xinerama", no_argument, 0, 0}, {"disable-signalhandler", no_argument, 0, 0}, {"shmlog-size", required_argument, 0, 0}, {"shmlog_size", required_argument, 0, 0}, {"get-socketpath", no_argument, 0, 0}, {"get_socketpath", no_argument, 0, 0}, {"fake_outputs", required_argument, 0, 0}, {"fake-outputs", required_argument, 0, 0}, {"force-old-config-parser-v4.4-only", no_argument, 0, 0}, {0, 0, 0, 0} }; int option_index = 0, opt; setlocale(LC_ALL, ""); /* Get the RLIMIT_CORE limit at startup time to restore this before * starting processes. */ getrlimit(RLIMIT_CORE, &original_rlimit_core); /* Disable output buffering to make redirects in .xsession actually useful for debugging */ if (!isatty(fileno(stdout))) setbuf(stdout, NULL); srand(time(NULL)); /* Init logging *before* initializing debug_build to guarantee early * (file) logging. */ init_logging(); /* On non-release builds, disable SHM logging by default. */ shmlog_size = (is_debug_build() ? 25 * 1024 * 1024 : 0); start_argv = argv; while ((opt = getopt_long(argc, argv, "c:CvmaL:hld:V", long_options, &option_index)) != -1) { switch (opt) { case 'a': LOG("Autostart disabled using -a\n"); autostart = false; break; case 'L': FREE(layout_path); layout_path = sstrdup(optarg); delete_layout_path = false; break; case 'c': FREE(override_configpath); override_configpath = sstrdup(optarg); break; case 'C': LOG("Checking configuration file only (-C)\n"); only_check_config = true; break; case 'v': printf("i3 version " I3_VERSION " © 2009-2012 Michael Stapelberg and contributors\n"); exit(EXIT_SUCCESS); break; case 'm': printf("Binary i3 version: " I3_VERSION " © 2009-2012 Michael Stapelberg and contributors\n"); display_running_version(); exit(EXIT_SUCCESS); break; case 'V': set_verbosity(true); break; case 'd': LOG("Enabling debug logging\n"); set_debug_logging(true); break; case 'l': /* DEPRECATED, ignored for the next 3 versions (3.e, 3.f, 3.g) */ break; case 0: if (strcmp(long_options[option_index].name, "force-xinerama") == 0 || strcmp(long_options[option_index].name, "force_xinerama") == 0) { force_xinerama = true; ELOG("Using Xinerama instead of RandR. This option should be " "avoided at all cost because it does not refresh the list " "of screens, so you cannot configure displays at runtime. " "Please check if your driver really does not support RandR " "and disable this option as soon as you can.\n"); break; } else if (strcmp(long_options[option_index].name, "disable-signalhandler") == 0) { disable_signalhandler = true; break; } else if (strcmp(long_options[option_index].name, "get-socketpath") == 0 || strcmp(long_options[option_index].name, "get_socketpath") == 0) { char *socket_path = root_atom_contents("I3_SOCKET_PATH"); if (socket_path) { printf("%s\n", socket_path); exit(EXIT_SUCCESS); } exit(EXIT_FAILURE); } else if (strcmp(long_options[option_index].name, "shmlog-size") == 0 || strcmp(long_options[option_index].name, "shmlog_size") == 0) { shmlog_size = atoi(optarg); /* Re-initialize logging immediately to get as many * logmessages as possible into the SHM log. */ init_logging(); LOG("Limiting SHM log size to %d bytes\n", shmlog_size); break; } else if (strcmp(long_options[option_index].name, "restart") == 0) { FREE(layout_path); layout_path = sstrdup(optarg); delete_layout_path = true; break; } else if (strcmp(long_options[option_index].name, "fake-outputs") == 0 || strcmp(long_options[option_index].name, "fake_outputs") == 0) { LOG("Initializing fake outputs: %s\n", optarg); fake_outputs = sstrdup(optarg); break; } else if (strcmp(long_options[option_index].name, "force-old-config-parser-v4.4-only") == 0) { LOG("FORCING OLD CONFIG PARSER!\n"); force_old_config_parser = true; break; } /* fall-through */ default: fprintf(stderr, "Usage: %s [-c configfile] [-d all] [-a] [-v] [-V] [-C]\n", argv[0]); fprintf(stderr, "\n"); fprintf(stderr, "\t-a disable autostart ('exec' lines in config)\n"); fprintf(stderr, "\t-c use the provided configfile instead\n"); fprintf(stderr, "\t-C validate configuration file and exit\n"); fprintf(stderr, "\t-d all enable debug output\n"); fprintf(stderr, "\t-L path to the serialized layout during restarts\n"); fprintf(stderr, "\t-v display version and exit\n"); fprintf(stderr, "\t-V enable verbose mode\n"); fprintf(stderr, "\n"); fprintf(stderr, "\t--force-xinerama\n" "\tUse Xinerama instead of RandR.\n" "\tThis option should only be used if you are stuck with the\n" "\told nVidia closed source driver (older than 302.17), which does\n" "\tnot support RandR.\n"); fprintf(stderr, "\n"); fprintf(stderr, "\t--get-socketpath\n" "\tRetrieve the i3 IPC socket path from X11, print it, then exit.\n"); fprintf(stderr, "\n"); fprintf(stderr, "\t--shmlog-size \n" "\tLimits the size of the i3 SHM log to bytes. Setting this\n" "\tto 0 disables SHM logging entirely.\n" "\tThe default is %d bytes.\n", shmlog_size); fprintf(stderr, "\n"); fprintf(stderr, "If you pass plain text arguments, i3 will interpret them as a command\n" "to send to a currently running i3 (like i3-msg). This allows you to\n" "use nice and logical commands, such as:\n" "\n" "\ti3 border none\n" "\ti3 floating toggle\n" "\ti3 kill window\n" "\n"); exit(EXIT_FAILURE); } } /* If the user passes more arguments, we act like i3-msg would: Just send * the arguments as an IPC message to i3. This allows for nice semantic * commands such as 'i3 border none'. */ if (!only_check_config && optind < argc) { /* We enable verbose mode so that the user knows what’s going on. * This should make it easier to find mistakes when the user passes * arguments by mistake. */ set_verbosity(true); LOG("Additional arguments passed. Sending them as a command to i3.\n"); char *payload = NULL; while (optind < argc) { if (!payload) { payload = sstrdup(argv[optind]); } else { char *both; sasprintf(&both, "%s %s", payload, argv[optind]); free(payload); payload = both; } optind++; } DLOG("Command is: %s (%zd bytes)\n", payload, strlen(payload)); char *socket_path = root_atom_contents("I3_SOCKET_PATH"); if (!socket_path) { ELOG("Could not get i3 IPC socket path\n"); return 1; } int sockfd = socket(AF_LOCAL, SOCK_STREAM, 0); if (sockfd == -1) err(EXIT_FAILURE, "Could not create socket"); struct sockaddr_un addr; memset(&addr, 0, sizeof(struct sockaddr_un)); addr.sun_family = AF_LOCAL; strncpy(addr.sun_path, socket_path, sizeof(addr.sun_path) - 1); if (connect(sockfd, (const struct sockaddr*)&addr, sizeof(struct sockaddr_un)) < 0) err(EXIT_FAILURE, "Could not connect to i3"); if (ipc_send_message(sockfd, strlen(payload), I3_IPC_MESSAGE_TYPE_COMMAND, (uint8_t*)payload) == -1) err(EXIT_FAILURE, "IPC: write()"); uint32_t reply_length; uint8_t *reply; int ret; if ((ret = ipc_recv_message(sockfd, I3_IPC_MESSAGE_TYPE_COMMAND, &reply_length, &reply)) != 0) { if (ret == -1) err(EXIT_FAILURE, "IPC: read()"); return 1; } printf("%.*s\n", reply_length, reply); return 0; } /* Enable logging to handle the case when the user did not specify --shmlog-size */ init_logging(); /* Try to enable core dumps by default when running a debug build */ if (is_debug_build()) { struct rlimit limit = { RLIM_INFINITY, RLIM_INFINITY }; setrlimit(RLIMIT_CORE, &limit); /* The following code is helpful, but not required. We thus don’t pay * much attention to error handling, non-linux or other edge cases. */ char cwd[PATH_MAX]; LOG("CORE DUMPS: You are running a development version of i3, so coredumps were automatically enabled (ulimit -c unlimited).\n"); if (getcwd(cwd, sizeof(cwd)) != NULL) LOG("CORE DUMPS: Your current working directory is \"%s\".\n", cwd); int patternfd; if ((patternfd = open("/proc/sys/kernel/core_pattern", O_RDONLY)) >= 0) { memset(cwd, '\0', sizeof(cwd)); if (read(patternfd, cwd, sizeof(cwd)) > 0) /* a trailing newline is included in cwd */ LOG("CORE DUMPS: Your core_pattern is: %s", cwd); close(patternfd); } } LOG("i3 " I3_VERSION " starting\n"); conn = xcb_connect(NULL, &conn_screen); if (xcb_connection_has_error(conn)) errx(EXIT_FAILURE, "Cannot open display\n"); sndisplay = sn_xcb_display_new(conn, NULL, NULL); /* Initialize the libev event loop. This needs to be done before loading * the config file because the parser will install an ev_child watcher * for the nagbar when config errors are found. */ main_loop = EV_DEFAULT; if (main_loop == NULL) die("Could not initialize libev. Bad LIBEV_FLAGS?\n"); root_screen = xcb_aux_get_screen(conn, conn_screen); root = root_screen->root; /* By default, we use the same depth and visual as the root window, which * usually is TrueColor (24 bit depth) and the corresponding visual. * However, we also check if a 32 bit depth and visual are available (for * transparency) and use it if so. */ root_depth = root_screen->root_depth; visual_id = root_screen->root_visual; colormap = root_screen->default_colormap; DLOG("root_depth = %d, visual_id = 0x%08x.\n", root_depth, visual_id); xcb_get_geometry_cookie_t gcookie = xcb_get_geometry(conn, root); xcb_query_pointer_cookie_t pointercookie = xcb_query_pointer(conn, root); load_configuration(conn, override_configpath, false); if (only_check_config) { LOG("Done checking configuration file. Exiting.\n"); exit(0); } if (config.ipc_socket_path == NULL) { /* Fall back to a file name in /tmp/ based on the PID */ if ((config.ipc_socket_path = getenv("I3SOCK")) == NULL) config.ipc_socket_path = get_process_filename("ipc-socket"); else config.ipc_socket_path = sstrdup(config.ipc_socket_path); } uint32_t mask = XCB_CW_EVENT_MASK; uint32_t values[] = { XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT | XCB_EVENT_MASK_BUTTON_PRESS | XCB_EVENT_MASK_STRUCTURE_NOTIFY | /* when the user adds a screen (e.g. video projector), the root window gets a ConfigureNotify */ XCB_EVENT_MASK_POINTER_MOTION | XCB_EVENT_MASK_PROPERTY_CHANGE | XCB_EVENT_MASK_ENTER_WINDOW }; xcb_void_cookie_t cookie; cookie = xcb_change_window_attributes_checked(conn, root, mask, values); check_error(conn, cookie, "Another window manager seems to be running"); xcb_get_geometry_reply_t *greply = xcb_get_geometry_reply(conn, gcookie, NULL); if (greply == NULL) { ELOG("Could not get geometry of the root window, exiting\n"); return 1; } DLOG("root geometry reply: (%d, %d) %d x %d\n", greply->x, greply->y, greply->width, greply->height); /* Place requests for the atoms we need as soon as possible */ #define xmacro(atom) \ xcb_intern_atom_cookie_t atom ## _cookie = xcb_intern_atom(conn, 0, strlen(#atom), #atom); #include "atoms.xmacro" #undef xmacro /* Initialize the Xlib connection */ xlibdpy = xkbdpy = XOpenDisplay(NULL); /* Try to load the X cursors and initialize the XKB extension */ if (xlibdpy == NULL) { ELOG("ERROR: XOpenDisplay() failed, disabling libXcursor/XKB support\n"); xcursor_supported = false; xkb_supported = false; } else if (fcntl(ConnectionNumber(xlibdpy), F_SETFD, FD_CLOEXEC) == -1) { ELOG("Could not set FD_CLOEXEC on xkbdpy\n"); return 1; } else { xcursor_load_cursors(); /*init_xkb();*/ } /* Set a cursor for the root window (otherwise the root window will show no cursor until the first client is launched). */ if (xcursor_supported) xcursor_set_root_cursor(XCURSOR_CURSOR_POINTER); else xcb_set_root_cursor(XCURSOR_CURSOR_POINTER); if (xkb_supported) { int errBase, major = XkbMajorVersion, minor = XkbMinorVersion; if (fcntl(ConnectionNumber(xkbdpy), F_SETFD, FD_CLOEXEC) == -1) { fprintf(stderr, "Could not set FD_CLOEXEC on xkbdpy\n"); return 1; } int i1; if (!XkbQueryExtension(xkbdpy,&i1,&xkb_event_base,&errBase,&major,&minor)) { fprintf(stderr, "XKB not supported by X-server\n"); return 1; } /* end of ugliness */ if (!XkbSelectEvents(xkbdpy, XkbUseCoreKbd, XkbMapNotifyMask | XkbStateNotifyMask, XkbMapNotifyMask | XkbStateNotifyMask)) { fprintf(stderr, "Could not set XKB event mask\n"); return 1; } } /* Setup NetWM atoms */ #define xmacro(name) \ do { \ xcb_intern_atom_reply_t *reply = xcb_intern_atom_reply(conn, name ## _cookie, NULL); \ if (!reply) { \ ELOG("Could not get atom " #name "\n"); \ exit(-1); \ } \ A_ ## name = reply->atom; \ free(reply); \ } while (0); #include "atoms.xmacro" #undef xmacro property_handlers_init(); ewmh_setup_hints(); keysyms = xcb_key_symbols_alloc(conn); xcb_numlock_mask = aio_get_mod_mask_for(XCB_NUM_LOCK, keysyms); translate_keysyms(); grab_all_keys(conn, false); bool needs_tree_init = true; if (layout_path) { LOG("Trying to restore the layout from %s...", layout_path); needs_tree_init = !tree_restore(layout_path, greply); if (delete_layout_path) unlink(layout_path); free(layout_path); } if (needs_tree_init) tree_init(greply); free(greply); /* Setup fake outputs for testing */ if (fake_outputs == NULL && config.fake_outputs != NULL) fake_outputs = config.fake_outputs; if (fake_outputs != NULL) { fake_outputs_init(fake_outputs); FREE(fake_outputs); config.fake_outputs = NULL; } else if (force_xinerama || config.force_xinerama) { /* Force Xinerama (for drivers which don't support RandR yet, esp. the * nVidia binary graphics driver), when specified either in the config * file or on command-line */ xinerama_init(); } else { DLOG("Checking for XRandR...\n"); randr_init(&randr_base); } scratchpad_fix_resolution(); xcb_query_pointer_reply_t *pointerreply; Output *output = NULL; if (!(pointerreply = xcb_query_pointer_reply(conn, pointercookie, NULL))) { ELOG("Could not query pointer position, using first screen\n"); } else { DLOG("Pointer at %d, %d\n", pointerreply->root_x, pointerreply->root_y); output = get_output_containing(pointerreply->root_x, pointerreply->root_y); if (!output) { ELOG("ERROR: No screen at (%d, %d), starting on the first screen\n", pointerreply->root_x, pointerreply->root_y); output = get_first_output(); } con_focus(con_descend_focused(output_get_content(output->con))); } tree_render(); /* Create the UNIX domain socket for IPC */ int ipc_socket = ipc_create_socket(config.ipc_socket_path); if (ipc_socket == -1) { ELOG("Could not create the IPC socket, IPC disabled\n"); } else { free(config.ipc_socket_path); struct ev_io *ipc_io = scalloc(sizeof(struct ev_io)); ev_io_init(ipc_io, ipc_new_client, ipc_socket, EV_READ); ev_io_start(main_loop, ipc_io); } /* Also handle the UNIX domain sockets passed via socket activation. The * parameter 1 means "remove the environment variables", we don’t want to * pass these to child processes. */ listen_fds = sd_listen_fds(0); if (listen_fds < 0) ELOG("socket activation: Error in sd_listen_fds\n"); else if (listen_fds == 0) DLOG("socket activation: no sockets passed\n"); else { int flags; for (int fd = SD_LISTEN_FDS_START; fd < (SD_LISTEN_FDS_START + listen_fds); fd++) { DLOG("socket activation: also listening on fd %d\n", fd); /* sd_listen_fds() enables FD_CLOEXEC by default. * However, we need to keep the file descriptors open for in-place * restarting, therefore we explicitly disable FD_CLOEXEC. */ if ((flags = fcntl(fd, F_GETFD)) < 0 || fcntl(fd, F_SETFD, flags & ~FD_CLOEXEC) < 0) { ELOG("Could not disable FD_CLOEXEC on fd %d\n", fd); } struct ev_io *ipc_io = scalloc(sizeof(struct ev_io)); ev_io_init(ipc_io, ipc_new_client, fd, EV_READ); ev_io_start(main_loop, ipc_io); } } /* Set up i3 specific atoms like I3_SOCKET_PATH and I3_CONFIG_PATH */ x_set_i3_atoms(); struct ev_io *xcb_watcher = scalloc(sizeof(struct ev_io)); struct ev_io *xkb = scalloc(sizeof(struct ev_io)); struct ev_check *xcb_check = scalloc(sizeof(struct ev_check)); struct ev_prepare *xcb_prepare = scalloc(sizeof(struct ev_prepare)); ev_io_init(xcb_watcher, xcb_got_event, xcb_get_file_descriptor(conn), EV_READ); ev_io_start(main_loop, xcb_watcher); if (xkb_supported) { ev_io_init(xkb, xkb_got_event, ConnectionNumber(xkbdpy), EV_READ); ev_io_start(main_loop, xkb); /* Flush the buffer so that libev can properly get new events */ XFlush(xkbdpy); } ev_check_init(xcb_check, xcb_check_cb); ev_check_start(main_loop, xcb_check); ev_prepare_init(xcb_prepare, xcb_prepare_cb); ev_prepare_start(main_loop, xcb_prepare); xcb_flush(conn); /* What follows is a fugly consequence of X11 protocol race conditions like * the following: In an i3 in-place restart, i3 will reparent all windows * to the root window, then exec() itself. In the new process, it calls * manage_existing_windows. However, in case any application sent a * generated UnmapNotify message to the WM (as GIMP does), this message * will be handled by i3 *after* managing the window, thus i3 thinks the * window just closed itself. In reality, the message was sent in the time * period where i3 wasn’t running yet. * * To prevent this, we grab the server (disables processing of any other * connections), then discard all pending events (since we didn’t do * anything, there cannot be any meaningful responses), then ungrab the * server. */ xcb_grab_server(conn); { xcb_aux_sync(conn); xcb_generic_event_t *event; while ((event = xcb_poll_for_event(conn)) != NULL) { if (event->response_type == 0) { free(event); continue; } /* Strip off the highest bit (set if the event is generated) */ int type = (event->response_type & 0x7F); /* We still need to handle MapRequests which are sent in the * timespan starting from when we register as a window manager and * this piece of code which drops events. */ if (type == XCB_MAP_REQUEST) handle_event(type, event); free(event); } manage_existing_windows(root); } xcb_ungrab_server(conn); struct sigaction action; action.sa_sigaction = handle_signal; action.sa_flags = SA_NODEFER | SA_RESETHAND | SA_SIGINFO; sigemptyset(&action.sa_mask); if (!disable_signalhandler) setup_signal_handler(); else { /* Catch all signals with default action "Core", see signal(7) */ if (sigaction(SIGQUIT, &action, NULL) == -1 || sigaction(SIGILL, &action, NULL) == -1 || sigaction(SIGABRT, &action, NULL) == -1 || sigaction(SIGFPE, &action, NULL) == -1 || sigaction(SIGSEGV, &action, NULL) == -1) ELOG("Could not setup signal handler"); } /* Catch all signals with default action "Term", see signal(7) */ if (sigaction(SIGHUP, &action, NULL) == -1 || sigaction(SIGINT, &action, NULL) == -1 || sigaction(SIGALRM, &action, NULL) == -1 || sigaction(SIGUSR1, &action, NULL) == -1 || sigaction(SIGUSR2, &action, NULL) == -1) ELOG("Could not setup signal handler"); /* Ignore SIGPIPE to survive errors when an IPC client disconnects * while we are sending him a message */ signal(SIGPIPE, SIG_IGN); /* Autostarting exec-lines */ if (autostart) { struct Autostart *exec; TAILQ_FOREACH(exec, &autostarts, autostarts) { LOG("auto-starting %s\n", exec->command); start_application(exec->command, exec->no_startup_id); } } /* Autostarting exec_always-lines */ struct Autostart *exec_always; TAILQ_FOREACH(exec_always, &autostarts_always, autostarts_always) { LOG("auto-starting (always!) %s\n", exec_always->command); start_application(exec_always->command, exec_always->no_startup_id); } /* Start i3bar processes for all configured bars */ Barconfig *barconfig; TAILQ_FOREACH(barconfig, &barconfigs, configs) { char *command = NULL; sasprintf(&command, "%s --bar_id=%s --socket=\"%s\"", barconfig->i3bar_command ? barconfig->i3bar_command : "i3bar", barconfig->id, current_socketpath); LOG("Starting bar process: %s\n", command); start_application(command, true); free(command); } /* Make sure to destroy the event loop to invoke the cleeanup callbacks * when calling exit() */ atexit(i3_exit); ev_loop(main_loop, 0); }