2 * vim:ts=4:sw=4:expandtab
4 * i3bar - an xcb-based status- and ws-bar for i3
5 * © 2010-2011 Axel Wagner and contributors (see also: LICENSE)
7 * ipc.c: Communicating with i3
16 #include <sys/socket.h>
25 const char *sock_path;
27 typedef void(*handler_t)(char*);
30 * Called, when we get a reply to a command from i3.
31 * Since i3 does not give us much feedback on commands, we do not much
34 void got_command_reply(char *reply) {
35 /* TODO: Error handling for command-replies */
39 * Called, when we get a reply with workspaces-data
42 void got_workspace_reply(char *reply) {
43 DLOG("Got Workspace-Data!\n");
44 parse_workspaces_json(reply);
49 * Called, when we get a reply for a subscription.
50 * Since i3 does not give us much feedback on commands, we do not much
53 void got_subscribe_reply(char *reply) {
54 DLOG("Got Subscribe Reply: %s\n", reply);
55 /* TODO: Error handling for subscribe-commands */
59 * Called, when we get a reply with outputs-data
62 void got_output_reply(char *reply) {
63 DLOG("Parsing Outputs-JSON...\n");
64 parse_outputs_json(reply);
65 DLOG("Reconfiguring Windows...\n");
71 * Called when we get the configuration for our bar instance
74 void got_bar_config(char *reply) {
75 DLOG("Received bar config \"%s\"\n", reply);
76 /* We initiate the main-function by requesting infos about the outputs and
77 * workspaces. Everything else (creating the bars, showing the right workspace-
78 * buttons and more) is taken care of by the event-drivenness of the code */
79 i3_send_msg(I3_IPC_MESSAGE_TYPE_GET_OUTPUTS, NULL);
80 parse_config_json(reply);
82 /* Now we can actually use 'config', so let's subscribe to the appropriate
83 * events and request the workspaces if necessary. */
85 if (!config.disable_ws)
86 i3_send_msg(I3_IPC_MESSAGE_TYPE_GET_WORKSPACES, NULL);
88 /* Initialize the rest of XCB */
89 init_xcb_late(config.fontname);
91 /* Resolve color strings to colorpixels and save them, then free the strings. */
92 init_colors(&(config.colors));
93 free_colors(&(config.colors));
95 /* The name of this function is actually misleading. Even if no command is
96 * specified, this function initiates the watchers to listen on stdin and
97 * react accordingly */
98 start_child(config.command);
102 /* Data-structure to easily call the reply-handlers later */
103 handler_t reply_handlers[] = {
105 &got_workspace_reply,
106 &got_subscribe_reply,
114 * Called, when a workspace-event arrives (i.e. the user changed the workspace)
117 void got_workspace_event(char *event) {
118 DLOG("Got Workspace Event!\n");
119 i3_send_msg(I3_IPC_MESSAGE_TYPE_GET_WORKSPACES, NULL);
123 * Called, when an output-event arrives (i.e. the screen-configuration changed)
126 void got_output_event(char *event) {
127 DLOG("Got Output Event!\n");
128 i3_send_msg(I3_IPC_MESSAGE_TYPE_GET_OUTPUTS, NULL);
129 if (!config.disable_ws) {
130 i3_send_msg(I3_IPC_MESSAGE_TYPE_GET_WORKSPACES, NULL);
134 /* Data-structure to easily call the reply-handlers later */
135 handler_t event_handlers[] = {
136 &got_workspace_event,
141 * Called, when we get a message from i3
144 void got_data(struct ev_loop *loop, ev_io *watcher, int events) {
146 int fd = watcher->fd;
148 /* First we only read the header, because we know its length */
149 uint32_t header_len = strlen(I3_IPC_MAGIC) + sizeof(uint32_t)*2;
150 char *header = smalloc(header_len);
152 /* We first parse the fixed-length IPC-header, to know, how much data
153 * we have to expect */
155 while (rec < header_len) {
156 int n = read(fd, header + rec, header_len - rec);
158 ELOG("read() failed: %s\n", strerror(errno));
162 /* EOF received. Since i3 will restart i3bar instances as appropriate,
164 DLOG("EOF received, exiting...\n");
171 if (strncmp(header, I3_IPC_MAGIC, strlen(I3_IPC_MAGIC))) {
172 ELOG("Wrong magic code: %.*s\n Expected: %s\n",
173 (int) strlen(I3_IPC_MAGIC),
179 char *walk = header + strlen(I3_IPC_MAGIC);
181 memcpy(&size, (uint32_t*)walk, sizeof(uint32_t));
182 walk += sizeof(uint32_t);
184 memcpy(&type, (uint32_t*)walk, sizeof(uint32_t));
186 /* Now that we know, what to expect, we can start read()ing the rest
188 char *buffer = smalloc(size + 1);
192 int n = read(fd, buffer + rec, size - rec);
194 ELOG("read() failed: %s\n", strerror(errno));
198 ELOG("Nothing to read!\n");
205 /* And call the callback (indexed by the type) */
206 if (type & (1 << 31)) {
208 event_handlers[type](buffer);
210 if (reply_handlers[type])
211 reply_handlers[type](buffer);
219 * Sends a Message to i3.
220 * type must be a valid I3_IPC_MESSAGE_TYPE (see i3/ipc.h for further information)
223 int i3_send_msg(uint32_t type, const char *payload) {
225 if (payload != NULL) {
226 len = strlen(payload);
229 /* We are a wellbehaved client and send a proper header first */
230 uint32_t to_write = strlen (I3_IPC_MAGIC) + sizeof(uint32_t)*2 + len;
231 /* TODO: I'm not entirely sure if this buffer really has to contain more
232 * than the pure header (why not just write() the payload from *payload?),
233 * but we leave it for now */
234 char *buffer = smalloc(to_write);
237 strncpy(buffer, I3_IPC_MAGIC, strlen(I3_IPC_MAGIC));
238 walk += strlen(I3_IPC_MAGIC);
239 memcpy(walk, &len, sizeof(uint32_t));
240 walk += sizeof(uint32_t);
241 memcpy(walk, &type, sizeof(uint32_t));
242 walk += sizeof(uint32_t);
245 strncpy(walk, payload, len);
247 uint32_t written = 0;
249 while (to_write > 0) {
250 int n = write(i3_connection->fd, buffer + written, to_write);
252 ELOG("write() failed: %s\n", strerror(errno));
266 * Initiate a connection to i3.
267 * socket-path must be a valid path to the ipc_socket of i3
270 int init_connection(const char *socket_path) {
271 sock_path = socket_path;
272 int sockfd = ipc_connect(socket_path);
273 i3_connection = smalloc(sizeof(ev_io));
274 ev_io_init(i3_connection, &got_data, sockfd, EV_READ);
275 ev_io_start(main_loop, i3_connection);
280 * Destroy the connection to i3.
282 void destroy_connection() {
283 close(i3_connection->fd);
284 ev_io_stop(main_loop, i3_connection);
288 * Subscribe to all the i3-events, we need
291 void subscribe_events() {
292 if (config.disable_ws) {
293 i3_send_msg(I3_IPC_MESSAGE_TYPE_SUBSCRIBE, "[ \"output\" ]");
295 i3_send_msg(I3_IPC_MESSAGE_TYPE_SUBSCRIBE, "[ \"workspace\", \"output\" ]");