236 lines
7.3 KiB
C
236 lines
7.3 KiB
C
/*
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* vim:ts=4:sw=4:expandtab
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*
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* i3 - an improved dynamic tiling window manager
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*
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* © 2009-2010 Michael Stapelberg and contributors
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*
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* See file LICENSE for license information.
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*
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* i3-msg/main.c: Utility which sends messages to a running i3-instance using
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* IPC via UNIX domain sockets.
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*
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* This serves as an example for how to send your own messages to i3.
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* Additionally, it’s even useful sometimes :-).
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*
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*/
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#include <ev.h>
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#include <stdio.h>
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#include <stdbool.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <err.h>
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#include <stdint.h>
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#include <getopt.h>
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#include <limits.h>
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#include <xcb/xcb.h>
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#include <xcb/xcb_aux.h>
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#include <i3/ipc.h>
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static char *socket_path;
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/*
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* Try to get the socket path from X11 and return NULL if it doesn’t work.
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* As i3-msg is a short-running tool, we don’t bother with cleaning up the
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* connection and leave it up to the operating system on exit.
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*
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*/
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static char *socket_path_from_x11() {
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xcb_connection_t *conn;
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int screen;
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if ((conn = xcb_connect(NULL, &screen)) == NULL ||
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xcb_connection_has_error(conn))
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return NULL;
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xcb_screen_t *root_screen = xcb_aux_get_screen(conn, screen);
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xcb_window_t root = root_screen->root;
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xcb_intern_atom_cookie_t atom_cookie;
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xcb_intern_atom_reply_t *atom_reply;
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atom_cookie = xcb_intern_atom(conn, 0, strlen("I3_SOCKET_PATH"), "I3_SOCKET_PATH");
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atom_reply = xcb_intern_atom_reply(conn, atom_cookie, NULL);
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if (atom_reply == NULL)
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return NULL;
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xcb_get_property_cookie_t prop_cookie;
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xcb_get_property_reply_t *prop_reply;
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prop_cookie = xcb_get_property_unchecked(conn, false, root, atom_reply->atom,
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XCB_GET_PROPERTY_TYPE_ANY, 0, PATH_MAX);
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prop_reply = xcb_get_property_reply(conn, prop_cookie, NULL);
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if (prop_reply == NULL || xcb_get_property_value_length(prop_reply) == 0)
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return NULL;
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if (asprintf(&socket_path, "%.*s", xcb_get_property_value_length(prop_reply),
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(char*)xcb_get_property_value(prop_reply)) == -1)
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return NULL;
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return socket_path;
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}
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/*
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* Formats a message (payload) of the given size and type and sends it to i3 via
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* the given socket file descriptor.
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*
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*/
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static void ipc_send_message(int sockfd, uint32_t message_size,
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uint32_t message_type, uint8_t *payload) {
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int buffer_size = strlen(I3_IPC_MAGIC) + sizeof(uint32_t) + sizeof(uint32_t) + message_size;
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char msg[buffer_size];
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char *walk = msg;
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strcpy(walk, I3_IPC_MAGIC);
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walk += strlen(I3_IPC_MAGIC);
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memcpy(walk, &message_size, sizeof(uint32_t));
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walk += sizeof(uint32_t);
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memcpy(walk, &message_type, sizeof(uint32_t));
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walk += sizeof(uint32_t);
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memcpy(walk, payload, message_size);
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int sent_bytes = 0;
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int bytes_to_go = buffer_size;
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while (sent_bytes < bytes_to_go) {
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int n = write(sockfd, msg + sent_bytes, bytes_to_go);
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if (n == -1)
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err(EXIT_FAILURE, "write() failed");
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sent_bytes += n;
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bytes_to_go -= n;
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}
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}
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static void ipc_recv_message(int sockfd, uint32_t message_type,
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uint32_t *reply_length, uint8_t **reply) {
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/* Read the message header first */
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uint32_t to_read = strlen(I3_IPC_MAGIC) + sizeof(uint32_t) + sizeof(uint32_t);
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char msg[to_read];
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char *walk = msg;
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uint32_t read_bytes = 0;
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while (read_bytes < to_read) {
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int n = read(sockfd, msg + read_bytes, to_read);
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if (n == -1)
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err(EXIT_FAILURE, "read() failed");
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if (n == 0)
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errx(EXIT_FAILURE, "received EOF instead of reply");
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read_bytes += n;
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to_read -= n;
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}
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if (memcmp(walk, I3_IPC_MAGIC, strlen(I3_IPC_MAGIC)) != 0)
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errx(EXIT_FAILURE, "invalid magic in reply");
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walk += strlen(I3_IPC_MAGIC);
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*reply_length = *((uint32_t*)walk);
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walk += sizeof(uint32_t);
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if (*((uint32_t*)walk) != message_type)
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errx(EXIT_FAILURE, "unexpected reply type (got %d, expected %d)", *((uint32_t*)walk), message_type);
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walk += sizeof(uint32_t);
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*reply = malloc(*reply_length);
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if ((*reply) == NULL)
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err(EXIT_FAILURE, "malloc() failed");
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to_read = *reply_length;
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read_bytes = 0;
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while (read_bytes < to_read) {
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int n = read(sockfd, *reply + read_bytes, to_read);
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if (n == -1)
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err(EXIT_FAILURE, "read() failed");
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read_bytes += n;
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to_read -= n;
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}
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}
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int main(int argc, char *argv[]) {
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socket_path = getenv("I3SOCK");
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int o, option_index = 0;
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int message_type = I3_IPC_MESSAGE_TYPE_COMMAND;
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char *payload = "";
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bool quiet = false;
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static struct option long_options[] = {
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{"socket", required_argument, 0, 's'},
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{"type", required_argument, 0, 't'},
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{"version", no_argument, 0, 'v'},
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{"quiet", no_argument, 0, 'q'},
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{"help", no_argument, 0, 'h'},
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{0, 0, 0, 0}
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};
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char *options_string = "s:t:vhq";
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while ((o = getopt_long(argc, argv, options_string, long_options, &option_index)) != -1) {
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if (o == 's') {
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if (socket_path != NULL)
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free(socket_path);
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socket_path = strdup(optarg);
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} else if (o == 't') {
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if (strcasecmp(optarg, "command") == 0)
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message_type = I3_IPC_MESSAGE_TYPE_COMMAND;
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else if (strcasecmp(optarg, "get_workspaces") == 0)
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message_type = I3_IPC_MESSAGE_TYPE_GET_WORKSPACES;
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else if (strcasecmp(optarg, "get_outputs") == 0)
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message_type = I3_IPC_MESSAGE_TYPE_GET_OUTPUTS;
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else if (strcasecmp(optarg, "get_tree") == 0)
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message_type = I3_IPC_MESSAGE_TYPE_GET_TREE;
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else {
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printf("Unknown message type\n");
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printf("Known types: command, get_workspaces, get_outputs, get_tree\n");
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exit(EXIT_FAILURE);
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}
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} else if (o == 'q') {
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quiet = true;
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} else if (o == 'v') {
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printf("i3-msg " I3_VERSION "\n");
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return 0;
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} else if (o == 'h') {
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printf("i3-msg " I3_VERSION "\n");
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printf("i3-msg [-s <socket>] [-t <type>] <message>\n");
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return 0;
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}
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}
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if (socket_path == NULL)
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socket_path = socket_path_from_x11();
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/* Fall back to the default socket path */
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if (socket_path == NULL)
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socket_path = strdup("/tmp/i3-ipc.sock");
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if (optind < argc)
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payload = argv[optind];
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int sockfd = socket(AF_LOCAL, SOCK_STREAM, 0);
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if (sockfd == -1)
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err(EXIT_FAILURE, "Could not create socket");
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struct sockaddr_un addr;
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memset(&addr, 0, sizeof(struct sockaddr_un));
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addr.sun_family = AF_LOCAL;
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strcpy(addr.sun_path, socket_path);
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if (connect(sockfd, (const struct sockaddr*)&addr, sizeof(struct sockaddr_un)) < 0)
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err(EXIT_FAILURE, "Could not connect to i3");
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ipc_send_message(sockfd, strlen(payload), message_type, (uint8_t*)payload);
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if (quiet)
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return 0;
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uint32_t reply_length;
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uint8_t *reply;
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ipc_recv_message(sockfd, message_type, &reply_length, &reply);
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printf("%.*s", reply_length, reply);
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free(reply);
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close(sockfd);
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return 0;
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}
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