gri3-wm/i3bar/src/ipc.c

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/*
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* vim:ts=4:sw=4:expandtab
*
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* i3bar - an xcb-based status- and ws-bar for i3
* © 2010-2012 Axel Wagner and contributors (see also: LICENSE)
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*
* ipc.c: Communicating with i3
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*
*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
#include <stdint.h>
#include <string.h>
#include <errno.h>
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#include <sys/socket.h>
#include <sys/un.h>
#include <i3/ipc.h>
#include <ev.h>
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#include "common.h"
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ev_io *i3_connection;
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const char *sock_path;
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typedef void(*handler_t)(char*);
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/*
* Called, when we get a reply to a command from i3.
* Since i3 does not give us much feedback on commands, we do not much
*
*/
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void got_command_reply(char *reply) {
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/* TODO: Error handling for command-replies */
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}
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/*
* Called, when we get a reply with workspaces-data
*
*/
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void got_workspace_reply(char *reply) {
DLOG("Got Workspace-Data!\n");
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parse_workspaces_json(reply);
draw_bars(false);
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}
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/*
* Called, when we get a reply for a subscription.
* Since i3 does not give us much feedback on commands, we do not much
*
*/
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void got_subscribe_reply(char *reply) {
DLOG("Got Subscribe Reply: %s\n", reply);
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/* TODO: Error handling for subscribe-commands */
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}
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/*
* Called, when we get a reply with outputs-data
*
*/
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void got_output_reply(char *reply) {
DLOG("Parsing Outputs-JSON...\n");
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parse_outputs_json(reply);
DLOG("Reconfiguring Windows...\n");
realloc_sl_buffer();
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reconfig_windows();
i3_output *o_walk;
SLIST_FOREACH(o_walk, outputs, slist) {
kick_tray_clients(o_walk);
}
draw_bars(false);
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}
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/*
* Called when we get the configuration for our bar instance
*
*/
void got_bar_config(char *reply) {
DLOG("Received bar config \"%s\"\n", reply);
/* We initiate the main-function by requesting infos about the outputs and
* workspaces. Everything else (creating the bars, showing the right workspace-
* buttons and more) is taken care of by the event-drivenness of the code */
i3_send_msg(I3_IPC_MESSAGE_TYPE_GET_OUTPUTS, NULL);
parse_config_json(reply);
/* Now we can actually use 'config', so let's subscribe to the appropriate
* events and request the workspaces if necessary. */
subscribe_events();
if (!config.disable_ws)
i3_send_msg(I3_IPC_MESSAGE_TYPE_GET_WORKSPACES, NULL);
/* Initialize the rest of XCB */
init_xcb_late(config.fontname);
/* Resolve color strings to colorpixels and save them, then free the strings. */
init_colors(&(config.colors));
free_colors(&(config.colors));
/* The name of this function is actually misleading. Even if no command is
* specified, this function initiates the watchers to listen on stdin and
* react accordingly */
start_child(config.command);
FREE(config.command);
}
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/* Data-structure to easily call the reply-handlers later */
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handler_t reply_handlers[] = {
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&got_command_reply,
&got_workspace_reply,
&got_subscribe_reply,
&got_output_reply,
NULL,
NULL,
&got_bar_config,
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};
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/*
* Called, when a workspace-event arrives (i.e. the user changed the workspace)
*
*/
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void got_workspace_event(char *event) {
DLOG("Got Workspace Event!\n");
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i3_send_msg(I3_IPC_MESSAGE_TYPE_GET_WORKSPACES, NULL);
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}
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/*
* Called, when an output-event arrives (i.e. the screen-configuration changed)
*
*/
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void got_output_event(char *event) {
DLOG("Got Output Event!\n");
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i3_send_msg(I3_IPC_MESSAGE_TYPE_GET_OUTPUTS, NULL);
if (!config.disable_ws) {
i3_send_msg(I3_IPC_MESSAGE_TYPE_GET_WORKSPACES, NULL);
}
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}
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/*
* Called, when a mode-event arrives (i3 changed binding mode).
*
*/
void got_mode_event(char *event) {
DLOG("Got Mode Event!\n");
parse_mode_json(event);
draw_bars(false);
}
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/* Data-structure to easily call the reply-handlers later */
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handler_t event_handlers[] = {
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&got_workspace_event,
&got_output_event,
&got_mode_event
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};
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/*
* Called, when we get a message from i3
*
*/
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void got_data(struct ev_loop *loop, ev_io *watcher, int events) {
DLOG("Got data!\n");
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int fd = watcher->fd;
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/* First we only read the header, because we know its length */
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uint32_t header_len = strlen(I3_IPC_MAGIC) + sizeof(uint32_t)*2;
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char *header = smalloc(header_len);
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/* We first parse the fixed-length IPC-header, to know, how much data
* we have to expect */
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uint32_t rec = 0;
while (rec < header_len) {
int n = read(fd, header + rec, header_len - rec);
if (n == -1) {
ELOG("read() failed: %s\n", strerror(errno));
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exit(EXIT_FAILURE);
}
if (n == 0) {
/* EOF received. Since i3 will restart i3bar instances as appropriate,
* we exit here. */
DLOG("EOF received, exiting...\n");
clean_xcb();
exit(EXIT_SUCCESS);
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}
rec += n;
}
if (strncmp(header, I3_IPC_MAGIC, strlen(I3_IPC_MAGIC))) {
ELOG("Wrong magic code: %.*s\n Expected: %s\n",
(int) strlen(I3_IPC_MAGIC),
header,
I3_IPC_MAGIC);
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exit(EXIT_FAILURE);
}
char *walk = header + strlen(I3_IPC_MAGIC);
uint32_t size;
memcpy(&size, (uint32_t*)walk, sizeof(uint32_t));
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walk += sizeof(uint32_t);
uint32_t type;
memcpy(&type, (uint32_t*)walk, sizeof(uint32_t));
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/* Now that we know, what to expect, we can start read()ing the rest
* of the message */
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char *buffer = smalloc(size + 1);
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rec = 0;
while (rec < size) {
int n = read(fd, buffer + rec, size - rec);
if (n == -1) {
ELOG("read() failed: %s\n", strerror(errno));
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exit(EXIT_FAILURE);
}
if (n == 0) {
ELOG("Nothing to read!\n");
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exit(EXIT_FAILURE);
}
rec += n;
}
buffer[size] = '\0';
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/* And call the callback (indexed by the type) */
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if (type & (1 << 31)) {
type ^= 1 << 31;
event_handlers[type](buffer);
} else {
if (reply_handlers[type])
reply_handlers[type](buffer);
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}
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FREE(header);
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FREE(buffer);
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}
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/*
* Sends a Message to i3.
* type must be a valid I3_IPC_MESSAGE_TYPE (see i3/ipc.h for further information)
*
*/
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int i3_send_msg(uint32_t type, const char *payload) {
uint32_t len = 0;
if (payload != NULL) {
len = strlen(payload);
}
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/* We are a wellbehaved client and send a proper header first */
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uint32_t to_write = strlen (I3_IPC_MAGIC) + sizeof(uint32_t)*2 + len;
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/* TODO: I'm not entirely sure if this buffer really has to contain more
* than the pure header (why not just write() the payload from *payload?),
* but we leave it for now */
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char *buffer = smalloc(to_write);
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char *walk = buffer;
strncpy(buffer, I3_IPC_MAGIC, strlen(I3_IPC_MAGIC));
walk += strlen(I3_IPC_MAGIC);
memcpy(walk, &len, sizeof(uint32_t));
walk += sizeof(uint32_t);
memcpy(walk, &type, sizeof(uint32_t));
walk += sizeof(uint32_t);
if (payload != NULL)
strncpy(walk, payload, len);
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uint32_t written = 0;
while (to_write > 0) {
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int n = write(i3_connection->fd, buffer + written, to_write);
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if (n == -1) {
ELOG("write() failed: %s\n", strerror(errno));
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exit(EXIT_FAILURE);
}
to_write -= n;
written += n;
}
FREE(buffer);
return 1;
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}
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/*
* Initiate a connection to i3.
* socket-path must be a valid path to the ipc_socket of i3
*
*/
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int init_connection(const char *socket_path) {
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sock_path = socket_path;
int sockfd = ipc_connect(socket_path);
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i3_connection = smalloc(sizeof(ev_io));
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ev_io_init(i3_connection, &got_data, sockfd, EV_READ);
ev_io_start(main_loop, i3_connection);
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return 1;
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}
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/*
* Destroy the connection to i3.
*/
void destroy_connection(void) {
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close(i3_connection->fd);
ev_io_stop(main_loop, i3_connection);
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}
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/*
* Subscribe to all the i3-events, we need
*
*/
void subscribe_events(void) {
if (config.disable_ws) {
i3_send_msg(I3_IPC_MESSAGE_TYPE_SUBSCRIBE, "[ \"output\", \"mode\" ]");
} else {
i3_send_msg(I3_IPC_MESSAGE_TYPE_SUBSCRIBE, "[ \"workspace\", \"output\", \"mode\" ]");
}
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}