Example #1
0
int main(int argc, char *argv[]) {
    char *env_socket_path = getenv("I3SOCK");
    if (env_socket_path)
        socket_path = sstrdup(env_socket_path);
    else
        socket_path = NULL;
    int o, option_index = 0;
    uint32_t message_type = I3_IPC_MESSAGE_TYPE_COMMAND;
    char *payload = NULL;
    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 = sstrdup(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;
            else if (strcasecmp(optarg, "get_marks") == 0)
                message_type = I3_IPC_MESSAGE_TYPE_GET_MARKS;
            else if (strcasecmp(optarg, "get_bar_config") == 0)
                message_type = I3_IPC_MESSAGE_TYPE_GET_BAR_CONFIG;
            else if (strcasecmp(optarg, "get_version") == 0)
                message_type = I3_IPC_MESSAGE_TYPE_GET_VERSION;
            else {
                printf("Unknown message type\n");
                printf("Known types: command, get_workspaces, get_outputs, get_tree, get_marks, get_bar_config, get_version\n");
                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;
        }
    }

    if (socket_path == NULL)
        socket_path = root_atom_contents("I3_SOCKET_PATH", NULL, 0);

    /* Fall back to the default socket path */
    if (socket_path == NULL)
        socket_path = sstrdup("/tmp/i3-ipc.sock");

    /* Use all arguments, separated by whitespace, as payload.
     * This way, you don’t have to do i3-msg 'mark foo', you can use
     * i3-msg mark foo */
    while (optind < argc) {
        if (!payload) {
            payload = sstrdup(argv[optind]);
        } else {
            char *both;
            sasprintf(&both, "%s %s", payload, argv[optind]);
            free(payload);
            payload = both;
        }
        optind++;
    }

    if (!payload)
        payload = "";

    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 on socket \"%s\"", socket_path);

    if (ipc_send_message(sockfd, strlen(payload), message_type, (uint8_t *)payload) == -1)
        err(EXIT_FAILURE, "IPC: write()");

    if (quiet)
        return 0;

    uint32_t reply_length;
    uint32_t reply_type;
    uint8_t *reply;
    int ret;
    if ((ret = ipc_recv_message(sockfd, &reply_type, &reply_length, &reply)) != 0) {
        if (ret == -1)
            err(EXIT_FAILURE, "IPC: read()");
        exit(1);
    }
    if (reply_type != message_type)
        errx(EXIT_FAILURE, "IPC: Received reply of type %d but expected %d", reply_type, message_type);
    /* For the reply of commands, have a look if that command was successful.
     * If not, nicely format the error message. */
    if (reply_type == I3_IPC_MESSAGE_TYPE_COMMAND) {
        yajl_handle handle;
        handle = yajl_alloc(&reply_callbacks, NULL, NULL);
        yajl_status state = yajl_parse(handle, (const unsigned char *)reply, reply_length);
        switch (state) {
            case yajl_status_ok:
                break;
            case yajl_status_client_canceled:
            case yajl_status_error:
                errx(EXIT_FAILURE, "IPC: Could not parse JSON reply.");
        }

        /* NB: We still fall-through and print the reply, because even if one
         * command failed, that doesn’t mean that all commands failed. */
    }
    printf("%.*s\n", reply_length, reply);
    free(reply);

    close(sockfd);

    return 0;
}
Example #2
0
File: main.c Project: stfnm/i3
int main(int argc, char *argv[]) {
    int o, option_index = 0;
    bool verbose = false,
         follow = false;

    static struct option long_options[] = {
        {"version", no_argument, 0, 'v'},
        {"verbose", no_argument, 0, 'V'},
        {"follow", no_argument, 0, 'f'},
        {"help", no_argument, 0, 'h'},
        {0, 0, 0, 0}
    };

    char *options_string = "s:vfVh";

    while ((o = getopt_long(argc, argv, options_string, long_options, &option_index)) != -1) {
        if (o == 'v') {
            printf("i3-dump-log " I3_VERSION "\n");
            return 0;
        } else if (o == 'V') {
            verbose = true;
        } else if (o == 'f') {
            follow = true;
        } else if (o == 'h') {
            printf("i3-dump-log " I3_VERSION "\n");
            printf("i3-dump-log [-f] [-s <socket>]\n");
            return 0;
        }
    }

    char *shmname = root_atom_contents("I3_SHMLOG_PATH");
    if (shmname == NULL) {
        /* Something failed. Let’s invest a little effort to find out what it
         * is. This is hugely helpful for users who want to debug i3 but are
         * not used to the procedure yet. */
        xcb_connection_t *conn;
        int screen;
        if ((conn = xcb_connect(NULL, &screen)) == NULL ||
            xcb_connection_has_error(conn)) {
            fprintf(stderr, "i3-dump-log: ERROR: Cannot connect to X11.\n\n");
            if (getenv("DISPLAY") == NULL) {
                fprintf(stderr, "Your DISPLAY environment variable is not set.\n");
                fprintf(stderr, "Are you running i3-dump-log via SSH or on a virtual console?\n");
                fprintf(stderr, "Try DISPLAY=:0 i3-dump-log\n");
                exit(1);
            }
            fprintf(stderr, "FYI: The DISPLAY environment variable is set to \"%s\".\n", getenv("DISPLAY"));
            exit(1);
        }
        if (root_atom_contents("I3_CONFIG_PATH") != NULL) {
            fprintf(stderr, "i3-dump-log: ERROR: i3 is running, but SHM logging is not enabled.\n\n");
            if (!is_debug_build()) {
                fprintf(stderr, "You seem to be using a release version of i3:\n  %s\n\n", I3_VERSION);
                fprintf(stderr, "Release versions do not use SHM logging by default,\ntherefore i3-dump-log does not work.\n\n");
                fprintf(stderr, "Please follow this guide instead:\nhttp://i3wm.org/docs/debugging-release-version.html\n");
                exit(1);
            }
        }
        errx(EXIT_FAILURE, "Cannot get I3_SHMLOG_PATH atom contents. Is i3 running on this display?");
    }

    if (*shmname == '\0')
        errx(EXIT_FAILURE, "Cannot dump log: SHM logging is disabled in i3.");

    struct stat statbuf;

    /* NB: While we must never read, we need O_RDWR for the pthread condvar. */
    int logbuffer_shm = shm_open(shmname, O_RDWR, 0);
    if (logbuffer_shm == -1)
        err(EXIT_FAILURE, "Could not shm_open SHM segment for the i3 log (%s)", shmname);

    if (fstat(logbuffer_shm, &statbuf) != 0)
        err(EXIT_FAILURE, "stat(%s)", shmname);

    /* NB: While we must never read, we need O_RDWR for the pthread condvar. */
    logbuffer = mmap(NULL, statbuf.st_size, PROT_READ | PROT_WRITE, MAP_SHARED, logbuffer_shm, 0);
    if (logbuffer == MAP_FAILED)
        err(EXIT_FAILURE, "Could not mmap SHM segment for the i3 log");

    header = (i3_shmlog_header*)logbuffer;

    if (verbose)
        printf("next_write = %d, last_wrap = %d, logbuffer_size = %d, shmname = %s\n",
               header->offset_next_write, header->offset_last_wrap, header->size, shmname);
    walk = logbuffer + header->offset_next_write;

    /* We first need to print old content in case there was at least one
     * wrapping already. */

    if (*walk != '\0') {
        /* In case there was a write to the buffer already, skip the first
         * old line, it very likely is mangled. Not a problem, though, the log
         * is chatty enough to have plenty lines left. */
        while (*walk != '\n')
            walk++;
        walk++;
    }

    /* In case there was no wrapping, this is a no-op, otherwise it prints the
     * old lines. */
    wrap_count = 0;
    check_for_wrap();

    /* Then start from the beginning and print the newer lines */
    walk = logbuffer + sizeof(i3_shmlog_header);
    print_till_end();

    if (follow) {
        /* Since pthread_cond_wait() expects a mutex, we need to provide one.
         * To not lock i3 (that’s bad, mhkay?) we just define one outside of
         * the shared memory. */
        pthread_mutex_t dummy_mutex = PTHREAD_MUTEX_INITIALIZER;
        pthread_mutex_lock(&dummy_mutex);
        while (1) {
            pthread_cond_wait(&(header->condvar), &dummy_mutex);
            /* If this was not a spurious wakeup, print the new lines. */
            if (header->offset_next_write != offset_next_write) {
                offset_next_write = header->offset_next_write;
                print_till_end();
            }
        }
    }

    return 0;
}
Example #3
0
File: main.c Project: stfnm/i3
/*
 * Creates the config file and tells i3 to reload.
 *
 */
static void finish() {
    printf("creating \"%s\"...\n", config_path);

    if (!(dpy = XOpenDisplay(NULL)))
        errx(1, "Could not connect to X11");

    FILE *kc_config = fopen(SYSCONFDIR "/i3/config.keycodes", "r");
    if (kc_config == NULL)
        err(1, "Could not open input file \"%s\"", SYSCONFDIR "/i3/config.keycodes");

    FILE *ks_config = fopen(config_path, "w");
    if (ks_config == NULL)
        err(1, "Could not open output config file \"%s\"", config_path);
    free(config_path);

    char *line = NULL;
    size_t len = 0;
#ifndef USE_FGETLN
    ssize_t read;
#endif
    bool head_of_file = true;

    /* write a header about auto-generation to the output file */
    fputs("# This file has been auto-generated by i3-config-wizard(1).\n", ks_config);
    fputs("# It will not be overwritten, so edit it as you like.\n", ks_config);
    fputs("#\n", ks_config);
    fputs("# Should you change your keyboard layout somewhen, delete\n", ks_config);
    fputs("# this file and re-run i3-config-wizard(1).\n", ks_config);
    fputs("#\n", ks_config);

#ifdef USE_FGETLN
    char *buf = NULL;
    while ((buf = fgetln(kc_config, &len)) != NULL) {
        /* fgetln does not return null-terminated strings */
        FREE(line);
        sasprintf(&line, "%.*s", len, buf);
#else
    size_t linecap = 0;
    while ((read = getline(&line, &linecap, kc_config)) != -1) {
        len = strlen(line);
#endif
        /* skip the warning block at the beginning of the input file */
        if (head_of_file &&
            strncmp("# WARNING", line, strlen("# WARNING")) == 0)
            continue;

        head_of_file = false;

        /* Skip leading whitespace */
        char *walk = line;
        while (isspace(*walk) && walk < (line + len)) {
            /* Pre-output the skipped whitespaces to keep proper indentation */
            fputc(*walk, ks_config);
            walk++;
        }

        /* Set the modifier the user chose */
        if (strncmp(walk, "set $mod ", strlen("set $mod ")) == 0) {
            if (modifier == MOD_Mod1)
                fputs("set $mod Mod1\n", ks_config);
            else fputs("set $mod Mod4\n", ks_config);
            continue;
        }

        /* Check for 'bindcode'. If it’s not a bindcode line, we
         * just copy it to the output file */
        if (strncmp(walk, "bindcode", strlen("bindcode")) != 0) {
            fputs(walk, ks_config);
            continue;
        }
        char *result = rewrite_binding(walk);
        fputs(result, ks_config);
        free(result);
    }

    /* sync to do our best in order to have the file really stored on disk */
    fflush(ks_config);
    fsync(fileno(ks_config));

#ifndef USE_FGETLN
    free(line);
#endif

    fclose(kc_config);
    fclose(ks_config);

    /* tell i3 to reload the config file */
    int sockfd = ipc_connect(socket_path);
    ipc_send_message(sockfd, strlen("reload"), 0, (uint8_t*)"reload");
    close(sockfd);

    exit(0);
}

int main(int argc, char *argv[]) {
    config_path = resolve_tilde("~/.i3/config");
    socket_path = getenv("I3SOCK");
    char *pattern = "-misc-fixed-medium-r-normal--13-120-75-75-C-70-iso10646-1";
    char *patternbold = "-misc-fixed-bold-r-normal--13-120-75-75-C-70-iso10646-1";
    int o, option_index = 0;

    static struct option long_options[] = {
        {"socket", required_argument, 0, 's'},
        {"version", no_argument, 0, 'v'},
        {"limit", required_argument, 0, 'l'},
        {"prompt", required_argument, 0, 'P'},
        {"prefix", required_argument, 0, 'p'},
        {"font", required_argument, 0, 'f'},
        {"help", no_argument, 0, 'h'},
        {0, 0, 0, 0}
    };

    char *options_string = "s:vh";

    while ((o = getopt_long(argc, argv, options_string, long_options, &option_index)) != -1) {
        switch (o) {
            case 's':
                FREE(socket_path);
                socket_path = strdup(optarg);
                break;
            case 'v':
                printf("i3-config-wizard " I3_VERSION "\n");
                return 0;
            case 'h':
                printf("i3-config-wizard " I3_VERSION "\n");
                printf("i3-config-wizard [-s <socket>] [-v]\n");
                return 0;
        }
    }

    /* Check if the destination config file does not exist but the path is
     * writable. If not, exit now, this program is not useful in that case. */
    struct stat stbuf;
    if (stat(config_path, &stbuf) == 0) {
        printf("The config file \"%s\" already exists. Exiting.\n", config_path);
        return 0;
    }

    /* Create ~/.i3 if it does not yet exist */
    char *config_dir = resolve_tilde("~/.i3");
    if (stat(config_dir, &stbuf) != 0)
        if (mkdir(config_dir, 0755) == -1)
            err(1, "mkdir(%s) failed", config_dir);
    free(config_dir);

    int fd;
    if ((fd = open(config_path, O_CREAT | O_RDWR, 0644)) == -1) {
        printf("Cannot open file \"%s\" for writing: %s. Exiting.\n", config_path, strerror(errno));
        return 0;
    }
    close(fd);
    unlink(config_path);

    if (socket_path == NULL)
        socket_path = root_atom_contents("I3_SOCKET_PATH");

    if (socket_path == NULL)
        socket_path = "/tmp/i3-ipc.sock";

    int screens;
    if ((conn = xcb_connect(NULL, &screens)) == NULL ||
        xcb_connection_has_error(conn))
        errx(1, "Cannot open display\n");

    xcb_get_modifier_mapping_cookie_t modmap_cookie;
    modmap_cookie = xcb_get_modifier_mapping(conn);
    symbols = xcb_key_symbols_alloc(conn);

    /* Place requests for the atoms we need as soon as possible */
    #define xmacro(atom) \
        xcb_intern_atom_cookie_t atom ## _cookie = xcb_intern_atom(conn, 0, strlen(#atom), #atom);
    #include "atoms.xmacro"
    #undef xmacro

    root_screen = xcb_aux_get_screen(conn, screens);
    root = root_screen->root;

    if (!(modmap_reply = xcb_get_modifier_mapping_reply(conn, modmap_cookie, NULL)))
        errx(EXIT_FAILURE, "Could not get modifier mapping\n");

    xcb_numlock_mask = get_mod_mask_for(XCB_NUM_LOCK, symbols, modmap_reply);

    font = load_font(pattern, true);
    bold_font = load_font(patternbold, true);

    /* Open an input window */
    win = xcb_generate_id(conn);
    xcb_create_window(
        conn,
        XCB_COPY_FROM_PARENT,
        win, /* the window id */
        root, /* parent == root */
        490, 297, 300, 205, /* dimensions */
        0, /* X11 border = 0, we draw our own */
        XCB_WINDOW_CLASS_INPUT_OUTPUT,
        XCB_WINDOW_CLASS_COPY_FROM_PARENT, /* copy visual from parent */
        XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK,
        (uint32_t[]){
            0, /* back pixel: black */
            XCB_EVENT_MASK_EXPOSURE |
            XCB_EVENT_MASK_BUTTON_PRESS
        });

    /* Map the window (make it visible) */
    xcb_map_window(conn, win);

    /* Setup NetWM atoms */
    #define xmacro(name) \
        do { \
            xcb_intern_atom_reply_t *reply = xcb_intern_atom_reply(conn, name ## _cookie, NULL); \
            if (!reply) \
                errx(EXIT_FAILURE, "Could not get atom " # name "\n"); \
            \
            A_ ## name = reply->atom; \
            free(reply); \
        } while (0);
    #include "atoms.xmacro"
    #undef xmacro

    /* Set dock mode */
    xcb_change_property(conn,
        XCB_PROP_MODE_REPLACE,
        win,
        A__NET_WM_WINDOW_TYPE,
        A_ATOM,
        32,
        1,
        (unsigned char*) &A__NET_WM_WINDOW_TYPE_DIALOG);

    /* Set window title */
    xcb_change_property(conn,
        XCB_PROP_MODE_REPLACE,
        win,
        A__NET_WM_NAME,
        A_UTF8_STRING,
        8,
        strlen("i3: first configuration"),
        "i3: first configuration");

    /* Create pixmap */
    pixmap = xcb_generate_id(conn);
    pixmap_gc = xcb_generate_id(conn);
    xcb_create_pixmap(conn, root_screen->root_depth, pixmap, win, 500, 500);
    xcb_create_gc(conn, pixmap_gc, pixmap, 0, 0);

    /* Grab the keyboard to get all input */
    xcb_flush(conn);

    /* Try (repeatedly, if necessary) to grab the keyboard. We might not
     * get the keyboard at the first attempt because of the keybinding
     * still being active when started via a wm’s keybinding. */
    xcb_grab_keyboard_cookie_t cookie;
    xcb_grab_keyboard_reply_t *reply = NULL;

    int count = 0;
    while ((reply == NULL || reply->status != XCB_GRAB_STATUS_SUCCESS) && (count++ < 500)) {
        cookie = xcb_grab_keyboard(conn, false, win, XCB_CURRENT_TIME, XCB_GRAB_MODE_ASYNC, XCB_GRAB_MODE_ASYNC);
        reply = xcb_grab_keyboard_reply(conn, cookie, NULL);
        usleep(1000);
    }

    if (reply->status != XCB_GRAB_STATUS_SUCCESS) {
        fprintf(stderr, "Could not grab keyboard, status = %d\n", reply->status);
        exit(-1);
    }

    xcb_flush(conn);

    xcb_generic_event_t *event;
    while ((event = xcb_wait_for_event(conn)) != NULL) {
        if (event->response_type == 0) {
            fprintf(stderr, "X11 Error received! sequence %x\n", event->sequence);
            continue;
        }

        /* Strip off the highest bit (set if the event is generated) */
        int type = (event->response_type & 0x7F);

        switch (type) {
            case XCB_KEY_PRESS:
                handle_key_press(NULL, conn, (xcb_key_press_event_t*)event);
                break;

            /* TODO: handle mappingnotify */

            case XCB_BUTTON_PRESS:
                handle_button_press((xcb_button_press_event_t*)event);
                break;

            case XCB_EXPOSE:
                handle_expose();
                break;
        }

        free(event);
    }

    return 0;
}
Example #4
0
/*
 * Connects to i3 to find out the currently running version. Useful since it
 * might be different from the version compiled into this binary (maybe the
 * user didn’t correctly install i3 or forgot te restart it).
 *
 * The output looks like this:
 * Running i3 version: 4.2-202-gb8e782c (2012-08-12, branch "next") (pid 14804)
 *
 * The i3 binary you just called: /home/michael/i3/i3
 * The i3 binary you are running: /home/michael/i3/i3
 *
 */
void display_running_version(void) {
    char *socket_path = root_atom_contents("I3_SOCKET_PATH", conn, conn_screen);
    if (socket_path == NULL)
        exit(EXIT_SUCCESS);

    char *pid_from_atom = root_atom_contents("I3_PID", conn, conn_screen);
    if (pid_from_atom == NULL) {
        /* If I3_PID is not set, the running version is older than 4.2-200. */
        printf("\nRunning version: < 4.2-200\n");
        exit(EXIT_SUCCESS);
    }

    /* Inform the user of what we are doing. While a single IPC request is
     * really fast normally, in case i3 hangs, this will not terminate. */
    printf("(Getting version from running i3, press ctrl-c to abort…)");
    fflush(stdout);

    /* TODO: refactor this with the code for sending commands */
    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, I3_IPC_MESSAGE_TYPE_GET_VERSION,
                         (uint8_t *)"") == -1)
        err(EXIT_FAILURE, "IPC: write()");

    uint32_t reply_length;
    uint32_t reply_type;
    uint8_t *reply;
    int ret;
    if ((ret = ipc_recv_message(sockfd, &reply_type, &reply_length, &reply)) != 0) {
        if (ret == -1)
            err(EXIT_FAILURE, "IPC: read()");
        exit(EXIT_FAILURE);
    }

    if (reply_type != I3_IPC_MESSAGE_TYPE_GET_VERSION)
        errx(EXIT_FAILURE, "Got reply type %d, but expected %d (GET_VERSION)", reply_type, I3_IPC_MESSAGE_TYPE_GET_VERSION);

    yajl_handle handle = yajl_alloc(&version_callbacks, NULL, NULL);

    yajl_status state = yajl_parse(handle, (const unsigned char *)reply, (int)reply_length);
    if (state != yajl_status_ok)
        errx(EXIT_FAILURE, "Could not parse my own reply. That's weird. reply is %.*s", (int)reply_length, reply);

    printf("\rRunning i3 version: %s (pid %s)\n", human_readable_version, pid_from_atom);

    if (loaded_config_file_name) {
        struct stat sb;
        time_t now;
        char mtime[64];
        printf("Loaded i3 config: %s", loaded_config_file_name);
        if (stat(loaded_config_file_name, &sb) == -1) {
            printf("\n");
            ELOG("Cannot stat config file \"%s\"\n", loaded_config_file_name);
        } else {
            strftime(mtime, sizeof(mtime), "%c", localtime(&(sb.st_mtime)));
            time(&now);
            printf(" (Last modified: %s, %.f seconds ago)\n", mtime, difftime(now, sb.st_mtime));
        }
    }

#ifdef __linux__
    size_t destpath_size = 1024;
    ssize_t linksize;
    char *exepath;
    char *destpath = smalloc(destpath_size);

    sasprintf(&exepath, "/proc/%d/exe", getpid());

    while ((linksize = readlink(exepath, destpath, destpath_size)) == (ssize_t)destpath_size) {
        destpath_size = destpath_size * 2;
        destpath = srealloc(destpath, destpath_size);
    }
    if (linksize == -1)
        err(EXIT_FAILURE, "readlink(%s)", exepath);

    /* readlink() does not NULL-terminate strings, so we have to. */
    destpath[linksize] = '\0';

    printf("\n");
    printf("The i3 binary you just called: %s\n", destpath);

    free(exepath);
    sasprintf(&exepath, "/proc/%s/exe", pid_from_atom);

    while ((linksize = readlink(exepath, destpath, destpath_size)) == (ssize_t)destpath_size) {
        destpath_size = destpath_size * 2;
        destpath = srealloc(destpath, destpath_size);
    }
    if (linksize == -1)
        err(EXIT_FAILURE, "readlink(%s)", exepath);

    /* readlink() does not NULL-terminate strings, so we have to. */
    destpath[linksize] = '\0';

    /* Check if "(deleted)" is the readlink result. If so, the running version
     * does not match the file on disk. */
    if (strstr(destpath, "(deleted)") != NULL)
        printf("RUNNING BINARY DIFFERENT FROM BINARY ON DISK!\n");

    /* Since readlink() might put a "(deleted)" somewhere in the buffer and
     * stripping that out seems hackish and ugly, we read the process’s argv[0]
     * instead. */
    free(exepath);
    sasprintf(&exepath, "/proc/%s/cmdline", pid_from_atom);

    int fd;
    if ((fd = open(exepath, O_RDONLY)) == -1)
        err(EXIT_FAILURE, "open(%s)", exepath);
    if (read(fd, destpath, sizeof(destpath)) == -1)
        err(EXIT_FAILURE, "read(%s)", exepath);
    close(fd);

    printf("The i3 binary you are running: %s\n", destpath);

    free(exepath);
    free(destpath);
#endif

    yajl_free(handle);
}