- if (socket_path == NULL)
- socket_path = socket_path_from_x11();
-
- /* Fall back to the default socket path */
- if (socket_path == NULL)
- socket_path = sstrdup("/tmp/i3-ipc.sock");
-
- int sockfd = socket(AF_LOCAL, SOCK_STREAM, 0);
- if (sockfd == -1)
- err(EXIT_FAILURE, "Could not create socket");
-
- 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);
- if (connect(sockfd, (const struct sockaddr*)&addr, sizeof(struct sockaddr_un)) < 0)
- err(EXIT_FAILURE, "Could not connect to i3");
-
- if (ipc_send_message(sockfd, 0, message_type, NULL) == -1)
- err(EXIT_FAILURE, "IPC: write()");
-
- uint32_t reply_length;
- uint8_t *reply;
- int ret;
- if ((ret = ipc_recv_message(sockfd, message_type, &reply_length, &reply)) != 0) {
- if (ret == -1)
- err(EXIT_FAILURE, "IPC: read()");
- exit(1);
- }
- char *buffer = NULL;
- sasprintf(&buffer, "%.*s", reply_length, reply);
- /* The reply will look like this:
- * {"offset_next_write":1729,"offset_last_wrap":1996,"size":2048,"shmname":"/i3-log-399"}
- * IMO, it’s not worth linking a JSON parser in just for this. If the
- * structure changes in the future, this decision needs to be re-evaluated
- * :). */
- int offset_next_write, offset_last_wrap, logbuffer_size;
- char *next_write_str = strstr(buffer, "offset_next_write"),
- *last_wrap_str = strstr(buffer, "offset_last_wrap"),
- *size_str = strstr(buffer, "size"),
- *shmname = strstr(buffer, "shmname");
- if (!next_write_str ||
- !last_wrap_str ||
- !size_str ||
- !shmname ||
- sscanf(next_write_str, "offset_next_write\":%d", &offset_next_write) != 1 ||
- sscanf(last_wrap_str, "offset_last_wrap\":%d", &offset_last_wrap) != 1 ||
- sscanf(size_str, "size\":%d", &logbuffer_size) != 1)
- errx(EXIT_FAILURE, "invalid IPC reply: %s\n", buffer);
-
- shmname += strlen("shmname\":\"");
- char *quote = strchr(shmname, '"');
- if (!quote)
- errx(EXIT_FAILURE, "invalid IPC reply: %s\n", buffer);
- *quote = '\0';
-
- if (verbose)
- printf("next_write = %d, last_wrap = %d, logbuffer_size = %d, shmname = %s\n",
- offset_next_write, offset_last_wrap, logbuffer_size, shmname);