2 * vim:ts=4:sw=4:expandtab
4 * i3bar - an xcb-based status- and ws-bar for i3
5 * © 2010 Axel Wagner and contributors (see also: LICENSE)
7 * ipc.c: Communicating with i3
18 #include <sys/socket.h>
22 #ifdef I3_ASAN_ENABLED
23 #include <sanitizer/lsan_interface.h>
28 const char *sock_path;
30 typedef void (*handler_t)(char *);
33 * Called, when we get a reply to a command from i3.
34 * Since i3 does not give us much feedback on commands, we do not much
37 void got_command_reply(char *reply) {
38 /* TODO: Error handling for command replies */
42 * Called, when we get a reply with workspaces data
45 void got_workspace_reply(char *reply) {
46 DLOG("Got workspace data!\n");
47 parse_workspaces_json(reply);
52 * Called, when we get a reply for a subscription.
53 * Since i3 does not give us much feedback on commands, we do not much
56 void got_subscribe_reply(char *reply) {
57 DLOG("Got subscribe reply: %s\n", reply);
58 /* TODO: Error handling for subscribe commands */
62 * Called, when we get a reply with outputs data
65 void got_output_reply(char *reply) {
66 DLOG("Parsing outputs JSON...\n");
67 parse_outputs_json(reply);
68 DLOG("Reconfiguring windows...\n");
69 reconfig_windows(false);
72 SLIST_FOREACH(o_walk, outputs, slist) {
73 kick_tray_clients(o_walk);
80 * Called when we get the configuration for our bar instance
83 void got_bar_config(char *reply) {
84 DLOG("Received bar config \"%s\"\n", reply);
85 /* We initiate the main function by requesting infos about the outputs and
86 * workspaces. Everything else (creating the bars, showing the right workspace-
87 * buttons and more) is taken care of by the event-drivenness of the code */
88 i3_send_msg(I3_IPC_MESSAGE_TYPE_GET_OUTPUTS, NULL);
90 free_colors(&(config.colors));
91 parse_config_json(reply);
93 /* Now we can actually use 'config', so let's subscribe to the appropriate
94 * events and request the workspaces if necessary. */
96 if (!config.disable_ws)
97 i3_send_msg(I3_IPC_MESSAGE_TYPE_GET_WORKSPACES, NULL);
99 /* Initialize the rest of XCB */
100 init_xcb_late(config.fontname);
102 /* Resolve color strings to colorpixels and save them, then free the strings. */
103 init_colors(&(config.colors));
105 start_child(config.command);
106 FREE(config.command);
109 /* Data structure to easily call the reply handlers later */
110 handler_t reply_handlers[] = {
112 &got_workspace_reply,
113 &got_subscribe_reply,
121 * Called, when a workspace event arrives (i.e. the user changed the workspace)
124 void got_workspace_event(char *event) {
125 DLOG("Got workspace event!\n");
126 i3_send_msg(I3_IPC_MESSAGE_TYPE_GET_WORKSPACES, NULL);
130 * Called, when an output event arrives (i.e. the screen configuration changed)
133 void got_output_event(char *event) {
134 DLOG("Got output event!\n");
135 i3_send_msg(I3_IPC_MESSAGE_TYPE_GET_OUTPUTS, NULL);
136 if (!config.disable_ws) {
137 i3_send_msg(I3_IPC_MESSAGE_TYPE_GET_WORKSPACES, NULL);
142 * Called, when a mode event arrives (i3 changed binding mode).
145 void got_mode_event(char *event) {
146 DLOG("Got mode event!\n");
147 parse_mode_json(event);
152 * Called, when a barconfig_update event arrives (i.e. i3 changed the bar hidden_state or mode)
155 void got_bar_config_update(char *event) {
156 /* check whether this affect this bar instance by checking the bar_id */
158 sasprintf(&expected_id, "\"id\":\"%s\"", config.bar_id);
159 char *found_id = strstr(event, expected_id);
161 if (found_id == NULL)
164 /* reconfigure the bar based on the current outputs */
165 i3_send_msg(I3_IPC_MESSAGE_TYPE_GET_OUTPUTS, NULL);
167 free_colors(&(config.colors));
169 /* update the configuration with the received settings */
170 DLOG("Received bar config update \"%s\"\n", event);
171 bar_display_mode_t old_mode = config.hide_on_modifier;
172 parse_config_json(event);
173 if (old_mode != config.hide_on_modifier) {
174 reconfig_windows(true);
177 /* update fonts and colors */
178 init_xcb_late(config.fontname);
179 init_colors(&(config.colors));
181 /* restart status command process */
183 start_child(config.command);
184 FREE(config.command);
189 /* Data structure to easily call the event handlers later */
190 handler_t event_handlers[] = {
191 &got_workspace_event,
195 &got_bar_config_update,
199 * Called, when we get a message from i3
202 void got_data(struct ev_loop *loop, ev_io *watcher, int events) {
204 int fd = watcher->fd;
206 /* First we only read the header, because we know its length */
207 uint32_t header_len = strlen(I3_IPC_MAGIC) + sizeof(uint32_t) * 2;
208 char *header = smalloc(header_len);
210 /* We first parse the fixed-length IPC header, to know, how much data
211 * we have to expect */
213 while (rec < header_len) {
214 int n = read(fd, header + rec, header_len - rec);
216 ELOG("read() failed: %s\n", strerror(errno));
220 /* EOF received. Since i3 will restart i3bar instances as appropriate,
222 DLOG("EOF received, exiting...\n");
223 #ifdef I3_ASAN_ENABLED
224 __lsan_do_leak_check();
232 if (strncmp(header, I3_IPC_MAGIC, strlen(I3_IPC_MAGIC))) {
233 ELOG("Wrong magic code: %.*s\n Expected: %s\n",
234 (int)strlen(I3_IPC_MAGIC),
240 char *walk = header + strlen(I3_IPC_MAGIC);
242 memcpy(&size, (uint32_t *)walk, sizeof(uint32_t));
243 walk += sizeof(uint32_t);
245 memcpy(&type, (uint32_t *)walk, sizeof(uint32_t));
247 /* Now that we know, what to expect, we can start read()ing the rest
249 char *buffer = smalloc(size + 1);
253 int n = read(fd, buffer + rec, size - rec);
255 ELOG("read() failed: %s\n", strerror(errno));
259 ELOG("Nothing to read!\n");
266 /* And call the callback (indexed by the type) */
267 if (type & (1 << 31)) {
269 event_handlers[type](buffer);
271 if (reply_handlers[type])
272 reply_handlers[type](buffer);
280 * Sends a message to i3.
281 * type must be a valid I3_IPC_MESSAGE_TYPE (see i3/ipc.h for further information)
284 int i3_send_msg(uint32_t type, const char *payload) {
286 if (payload != NULL) {
287 len = strlen(payload);
290 /* We are a wellbehaved client and send a proper header first */
291 uint32_t to_write = strlen(I3_IPC_MAGIC) + sizeof(uint32_t) * 2 + len;
292 /* TODO: I'm not entirely sure if this buffer really has to contain more
293 * than the pure header (why not just write() the payload from *payload?),
294 * but we leave it for now */
295 char *buffer = smalloc(to_write);
298 strncpy(buffer, I3_IPC_MAGIC, strlen(I3_IPC_MAGIC));
299 walk += strlen(I3_IPC_MAGIC);
300 memcpy(walk, &len, sizeof(uint32_t));
301 walk += sizeof(uint32_t);
302 memcpy(walk, &type, sizeof(uint32_t));
303 walk += sizeof(uint32_t);
306 strncpy(walk, payload, len);
308 swrite(i3_connection->fd, buffer, to_write);
316 * Initiate a connection to i3.
317 * socket_path must be a valid path to the ipc_socket of i3
320 int init_connection(const char *socket_path) {
321 sock_path = socket_path;
322 int sockfd = ipc_connect(socket_path);
323 i3_connection = smalloc(sizeof(ev_io));
324 ev_io_init(i3_connection, &got_data, sockfd, EV_READ);
325 ev_io_start(main_loop, i3_connection);
330 * Destroy the connection to i3.
332 void destroy_connection(void) {
333 close(i3_connection->fd);
334 ev_io_stop(main_loop, i3_connection);
338 * Subscribe to all the i3-events, we need
341 void subscribe_events(void) {
342 if (config.disable_ws) {
343 i3_send_msg(I3_IPC_MESSAGE_TYPE_SUBSCRIBE, "[ \"output\", \"mode\", \"barconfig_update\" ]");
345 i3_send_msg(I3_IPC_MESSAGE_TYPE_SUBSCRIBE, "[ \"workspace\", \"output\", \"mode\", \"barconfig_update\" ]");