gri3-wm/i3-msg/main.c

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/*
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* vim:ts=4:sw=4:expandtab
*
* i3 - an improved dynamic tiling window manager
*
* © 2009-2010 Michael Stapelberg and contributors
*
* See file LICENSE for license information.
*
* i3-msg/main.c: Utility which sends messages to a running i3-instance using
* IPC via UNIX domain sockets.
*
* This serves as an example for how to send your own messages to i3.
* Additionally, its even useful sometimes :-).
*
*/
#include <ev.h>
#include <stdio.h>
#include <stdbool.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <err.h>
#include <stdint.h>
#include <getopt.h>
#include <limits.h>
#include <xcb/xcb.h>
#include <xcb/xcb_aux.h>
#include "libi3.h"
#include <i3/ipc.h>
static char *socket_path;
/*
* Formats a message (payload) of the given size and type and sends it to i3 via
* the given socket file descriptor.
*
*/
static void ipc_send_message(int sockfd, uint32_t message_size,
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;
char msg[buffer_size];
char *walk = msg;
strcpy(walk, I3_IPC_MAGIC);
walk += strlen(I3_IPC_MAGIC);
memcpy(walk, &message_size, sizeof(uint32_t));
walk += sizeof(uint32_t);
memcpy(walk, &message_type, sizeof(uint32_t));
walk += sizeof(uint32_t);
memcpy(walk, payload, message_size);
int sent_bytes = 0;
int bytes_to_go = buffer_size;
while (sent_bytes < bytes_to_go) {
int n = write(sockfd, msg + sent_bytes, bytes_to_go);
if (n == -1)
err(EXIT_FAILURE, "write() failed");
sent_bytes += n;
bytes_to_go -= n;
}
}
static void ipc_recv_message(int sockfd, uint32_t message_type,
uint32_t *reply_length, uint8_t **reply) {
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/* Read the message header first */
uint32_t to_read = strlen(I3_IPC_MAGIC) + sizeof(uint32_t) + sizeof(uint32_t);
char msg[to_read];
char *walk = msg;
uint32_t read_bytes = 0;
while (read_bytes < to_read) {
int n = read(sockfd, msg + read_bytes, to_read);
if (n == -1)
err(EXIT_FAILURE, "read() failed");
if (n == 0)
errx(EXIT_FAILURE, "received EOF instead of reply");
read_bytes += n;
to_read -= n;
}
if (memcmp(walk, I3_IPC_MAGIC, strlen(I3_IPC_MAGIC)) != 0)
errx(EXIT_FAILURE, "invalid magic in reply");
walk += strlen(I3_IPC_MAGIC);
*reply_length = *((uint32_t*)walk);
walk += sizeof(uint32_t);
if (*((uint32_t*)walk) != message_type)
errx(EXIT_FAILURE, "unexpected reply type (got %d, expected %d)", *((uint32_t*)walk), message_type);
walk += sizeof(uint32_t);
*reply = malloc(*reply_length);
if ((*reply) == NULL)
err(EXIT_FAILURE, "malloc() failed");
to_read = *reply_length;
read_bytes = 0;
while (read_bytes < to_read) {
int n = read(sockfd, *reply + read_bytes, to_read);
if (n == -1)
err(EXIT_FAILURE, "read() failed");
read_bytes += n;
to_read -= n;
}
}
int main(int argc, char *argv[]) {
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socket_path = getenv("I3SOCK");
int o, option_index = 0;
int message_type = I3_IPC_MESSAGE_TYPE_COMMAND;
char *payload = NULL;
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bool quiet = false;
static struct option long_options[] = {
{"socket", required_argument, 0, 's'},
{"type", required_argument, 0, 't'},
{"version", no_argument, 0, 'v'},
{"quiet", no_argument, 0, 'q'},
{"help", no_argument, 0, 'h'},
{0, 0, 0, 0}
};
char *options_string = "s:t:vhq";
while ((o = getopt_long(argc, argv, options_string, long_options, &option_index)) != -1) {
if (o == 's') {
if (socket_path != NULL)
free(socket_path);
socket_path = strdup(optarg);
} else if (o == 't') {
if (strcasecmp(optarg, "command") == 0)
message_type = I3_IPC_MESSAGE_TYPE_COMMAND;
else if (strcasecmp(optarg, "get_workspaces") == 0)
message_type = I3_IPC_MESSAGE_TYPE_GET_WORKSPACES;
else if (strcasecmp(optarg, "get_outputs") == 0)
message_type = I3_IPC_MESSAGE_TYPE_GET_OUTPUTS;
else if (strcasecmp(optarg, "get_tree") == 0)
message_type = I3_IPC_MESSAGE_TYPE_GET_TREE;
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else if (strcasecmp(optarg, "get_marks") == 0)
message_type = I3_IPC_MESSAGE_TYPE_GET_MARKS;
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else {
printf("Unknown message type\n");
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printf("Known types: command, get_workspaces, get_outputs, get_tree, get_marks\n");
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exit(EXIT_FAILURE);
}
} else if (o == 'q') {
quiet = true;
} else if (o == 'v') {
printf("i3-msg " I3_VERSION "\n");
return 0;
} else if (o == 'h') {
printf("i3-msg " I3_VERSION "\n");
printf("i3-msg [-s <socket>] [-t <type>] <message>\n");
return 0;
}
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}
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if (socket_path == NULL)
socket_path = socket_path_from_x11();
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/* Fall back to the default socket path */
if (socket_path == NULL)
socket_path = strdup("/tmp/i3-ipc.sock");
/* Use all arguments, separated by whitespace, as payload.
* This way, you dont have to do i3-msg 'mark foo', you can use
* i3-msg mark foo */
while (optind < argc) {
if (!payload) {
if (!(payload = strdup(argv[optind])))
err(EXIT_FAILURE, "strdup(argv[optind])");
} else {
char *both;
if (asprintf(&both, "%s %s", payload, argv[optind]) == -1)
err(EXIT_FAILURE, "asprintf");
free(payload);
payload = both;
}
optind++;
}
if (!payload)
payload = "";
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int sockfd = socket(AF_LOCAL, SOCK_STREAM, 0);
if (sockfd == -1)
err(EXIT_FAILURE, "Could not create socket");
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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);
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if (connect(sockfd, (const struct sockaddr*)&addr, sizeof(struct sockaddr_un)) < 0)
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)
return 0;
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uint32_t reply_length;
uint8_t *reply;
ipc_recv_message(sockfd, message_type, &reply_length, &reply);
printf("%.*s\n", reply_length, reply);
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free(reply);
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close(sockfd);
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return 0;
}