i3status/i3status.c

/*
 * vim:ts=4:sw=4:expandtab
 *
 * i3status – Generates a status line for dzen2 or xmobar
 *
 * Copyright © 2008 Michael Stapelberg and contributors
 * Copyright © 2009 Thorsten Toepper <atsutane at freethoughts dot de>
 * Copyright © 2010 Axel Wagner <mail at merovius dot de>
 * Copyright © 2010 Fernando Tarlá Cardoso Lemos <fernandotcl at gmail dot com>
 *
 * See file LICENSE for license information.
 *
 */
#include <limits.h>
#include <string.h>
#include <stdio.h>
#include <stdbool.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <getopt.h>
#include <signal.h>
#include <confuse.h>
#include <glob.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <time.h>
#include <sys/time.h>
#include <locale.h>

#include <yajl/yajl_gen.h>
#include <yajl/yajl_version.h>

#include "i3status.h"

#define exit_if_null(pointer, ...) \
    {                              \
        if (pointer == NULL)       \
            die(__VA_ARGS__);      \
    }

#define CFG_CUSTOM_ALIGN_OPT \
    CFG_STR_CB("align", NULL, CFGF_NONE, parse_align)

#define CFG_COLOR_OPTS(good, degraded, bad)             \
    CFG_STR("color_good", good, CFGF_NONE),             \
        CFG_STR("color_degraded", degraded, CFGF_NONE), \
        CFG_STR("color_bad", bad, CFGF_NONE)

#define CFG_CUSTOM_COLOR_OPTS CFG_COLOR_OPTS(NULL, NULL, NULL)

#define CFG_CUSTOM_MIN_WIDTH_OPT \
    CFG_PTR_CB("min_width", NULL, CFGF_NONE, parse_min_width, free)

#define CFG_CUSTOM_SEPARATOR_OPT \
    CFG_BOOL("separator", 0, CFGF_NODEFAULT)

#define CFG_CUSTOM_SEP_BLOCK_WIDTH_OPT \
    CFG_INT("separator_block_width", 0, CFGF_NODEFAULT)

/* socket file descriptor for general purposes */
int general_socket;

static bool exit_upon_signal = false;

cfg_t *cfg, *cfg_general, *cfg_section;

void **cur_instance;

pthread_t main_thread;

/*
 * Set the exit_upon_signal flag, because one cannot do anything in a safe
 * manner in a signal handler (e.g. fprintf, which we really want to do for
 * debugging purposes), see
 * https://www.securecoding.cert.org/confluence/display/seccode/SIG30-C.+Call+only+asynchronous-safe+functions+within+signal+handlers
 *
 */
void fatalsig(int signum) {
    exit_upon_signal = true;
}

/*
 * Do nothing upon SIGUSR1. Running this signal handler will nevertheless
 * interrupt nanosleep() so that i3status immediately generates new output.
 *
 */
void sigusr1(int signum) {
}

/*
 * Checks if the given path exists by calling stat().
 *
 */
static bool path_exists(const char *path) {
    struct stat buf;
    return (stat(path, &buf) == 0);
}

static void *scalloc(size_t size) {
    void *result = calloc(size, 1);
    exit_if_null(result, "Error: out of memory (calloc(%zd))\n", size);
    return result;
}

static char *sstrdup(const char *str) {
    char *result = strdup(str);
    exit_if_null(result, "Error: out of memory (strdup())\n");
    return result;
}

/*
 * Parses the "align" module option (to validate input).
 */
static int parse_align(cfg_t *context, cfg_opt_t *option, const char *value, void *result) {
    if (strcasecmp(value, "left") != 0 && strcasecmp(value, "right") != 0 && strcasecmp(value, "center") != 0)
        die("Invalid alignment attribute found in section %s, line %d: \"%s\"\n"
            "Valid attributes are: left, center, right\n",
            context->name, context->line, value);

    const char **cresult = result;
    *cresult = value;

    return 0;
}

/*
 * Parses the "min_width" module option whose value can either be a string or an integer.
 */
static int parse_min_width(cfg_t *context, cfg_opt_t *option, const char *value, void *result) {
    char *end;
    long num = strtol(value, &end, 10);

    if (num < 0)
        die("Invalid min_width attribute found in section %s, line %d: %d\n"
            "Expected positive integer or string\n",
            context->name, context->line, num);
    else if (num == LONG_MIN || num == LONG_MAX || (end && *end != '\0'))
        num = 0;

    if (strlen(value) == 0)
        die("Empty min_width attribute found in section %s, line %d\n"
            "Expected positive integer or non-empty string\n",
            context->name, context->line);

    if (strcmp(value, "0") == 0)
        die("Invalid min_width attribute found in section %s, line %d: \"%s\"\n"
            "Expected positive integer or string\n",
            context->name, context->line, value);

    struct min_width *parsed = scalloc(sizeof(struct min_width));
    parsed->num = num;

    /* num is preferred, but if it’s 0 (i.e. not valid), store and use
     * the raw string value */
    if (num == 0)
        parsed->str = sstrdup(value);

    struct min_width **cresult = result;
    *cresult = parsed;

    return 0;
}

/*
 * Validates a color in "#RRGGBB" format
 *
 */
static int valid_color(const char *value) {
    const int len = strlen(value);

    if (output_format == O_LEMONBAR) {
        /* lemonbar supports an optional alpha channel */
        if (len != strlen("#rrggbb") && len != strlen("#aarrggbb")) {
            return 0;
        }
    } else {
        if (len != strlen("#rrggbb")) {
            return 0;
        }
    }
    if (value[0] != '#')
        return 0;
    for (int i = 1; i < len; ++i) {
        if (value[i] >= '0' && value[i] <= '9')
            continue;
        if (value[i] >= 'a' && value[i] <= 'f')
            continue;
        if (value[i] >= 'A' && value[i] <= 'F')
            continue;
        return 0;
    }
    return 1;
}

/*
 * This function resolves ~ in pathnames.
 * It may resolve wildcards in the first part of the path, but if no match
 * or multiple matches are found, it just returns a copy of path as given.
 *
 */
static char *resolve_tilde(const char *path) {
    static glob_t globbuf;
    char *head, *tail, *result = NULL;

    tail = strchr(path, '/');
    head = strndup(path, tail ? (size_t)(tail - path) : strlen(path));

    int res = glob(head, GLOB_TILDE, NULL, &globbuf);
    free(head);
    /* no match, or many wildcard matches are bad */
    if (res == GLOB_NOMATCH || globbuf.gl_pathc != 1)
        result = sstrdup(path);
    else if (res != 0) {
        die("glob() failed");
    } else {
        head = globbuf.gl_pathv[0];
        result = scalloc(strlen(head) + (tail ? strlen(tail) : 0) + 1);
        strncpy(result, head, strlen(head));
        if (tail)
            strncat(result, tail, strlen(tail));
    }
    globfree(&globbuf);

    return result;
}

static char *get_config_path(void) {
    char *xdg_config_home, *xdg_config_dirs, *config_path;

    /* 1: check the traditional path under the home directory */
    config_path = resolve_tilde("~/.i3status.conf");
    if (path_exists(config_path))
        return config_path;

    /* 2: check for $XDG_CONFIG_HOME/i3status/config */
    if ((xdg_config_home = getenv("XDG_CONFIG_HOME")) == NULL)
        xdg_config_home = "~/.config";

    xdg_config_home = resolve_tilde(xdg_config_home);
    if (asprintf(&config_path, "%s/i3status/config", xdg_config_home) == -1)
        die("asprintf() failed");
    free(xdg_config_home);

    if (path_exists(config_path))
        return config_path;
    free(config_path);

    /* 3: check the traditional path under /etc */
    config_path = SYSCONFDIR "/i3status.conf";
    if (path_exists(config_path))
        return sstrdup(config_path);

    /* 4: check for $XDG_CONFIG_DIRS/i3status/config */
    if ((xdg_config_dirs = getenv("XDG_CONFIG_DIRS")) == NULL)
        xdg_config_dirs = "/etc/xdg";

    char *buf = strdup(xdg_config_dirs);
    char *tok = strtok(buf, ":");
    while (tok != NULL) {
        tok = resolve_tilde(tok);
        if (asprintf(&config_path, "%s/i3status/config", tok) == -1)
            die("asprintf() failed");
        free(tok);
        if (path_exists(config_path)) {
            free(buf);
            return config_path;
        }
        free(config_path);
        tok = strtok(NULL, ":");
    }
    free(buf);

    die("Unable to find the configuration file (looked at "
        "~/.i3status.conf, $XDG_CONFIG_HOME/i3status/config, "
        "/etc/i3status.conf and $XDG_CONFIG_DIRS/i3status/config)");
    return NULL;
}

/*
 * Returns the default separator to use if no custom separator has been specified.
 */
static char *get_default_separator() {
    if (output_format == O_DZEN2)
        return "^p(5;-2)^ro(2)^p()^p(5)";
    if (output_format == O_I3BAR)
        // anything besides the empty string indicates that the default separator should be used
        return "default";
    return " | ";
}

int main(int argc, char *argv[]) {
    unsigned int j;

    cfg_opt_t general_opts[] = {
        CFG_STR("output_format", "auto", CFGF_NONE),
        CFG_BOOL("colors", 1, CFGF_NONE),
        CFG_STR("separator", "default", CFGF_NONE),
        CFG_STR("color_separator", "#333333", CFGF_NONE),
        CFG_INT("interval", 1, CFGF_NONE),
        CFG_COLOR_OPTS("#00FF00", "#FFFF00", "#FF0000"),
        CFG_STR("markup", "none", CFGF_NONE),
        CFG_END()};

    cfg_opt_t run_watch_opts[] = {
        CFG_STR("pidfile", NULL, CFGF_NONE),
        CFG_STR("format", "%title: %status", CFGF_NONE),
        CFG_STR("format_down", NULL, CFGF_NONE),
        CFG_CUSTOM_ALIGN_OPT,
        CFG_CUSTOM_COLOR_OPTS,
        CFG_CUSTOM_MIN_WIDTH_OPT,
        CFG_CUSTOM_SEPARATOR_OPT,
        CFG_CUSTOM_SEP_BLOCK_WIDTH_OPT,
        CFG_END()};

    cfg_opt_t path_exists_opts[] = {
        CFG_STR("path", NULL, CFGF_NONE),
        CFG_STR("format", "%title: %status", CFGF_NONE),
        CFG_STR("format_down", NULL, CFGF_NONE),
        CFG_CUSTOM_ALIGN_OPT,
        CFG_CUSTOM_COLOR_OPTS,
        CFG_CUSTOM_MIN_WIDTH_OPT,
        CFG_CUSTOM_SEPARATOR_OPT,
        CFG_CUSTOM_SEP_BLOCK_WIDTH_OPT,
        CFG_END()};

    cfg_opt_t wireless_opts[] = {
        CFG_STR("format_up", "W: (%quality at %essid, %bitrate) %ip", CFGF_NONE),
        CFG_STR("format_down", "W: down", CFGF_NONE),
        CFG_CUSTOM_ALIGN_OPT,
        CFG_CUSTOM_COLOR_OPTS,
        CFG_CUSTOM_MIN_WIDTH_OPT,
        CFG_CUSTOM_SEPARATOR_OPT,
        CFG_CUSTOM_SEP_BLOCK_WIDTH_OPT,
        CFG_END()};

    cfg_opt_t ethernet_opts[] = {
        CFG_STR("format_up", "E: %ip (%speed)", CFGF_NONE),
        CFG_STR("format_down", "E: down", CFGF_NONE),
        CFG_CUSTOM_ALIGN_OPT,
        CFG_CUSTOM_COLOR_OPTS,
        CFG_CUSTOM_MIN_WIDTH_OPT,
        CFG_CUSTOM_SEPARATOR_OPT,
        CFG_CUSTOM_SEP_BLOCK_WIDTH_OPT,
        CFG_END()};

    cfg_opt_t ipv6_opts[] = {
        CFG_STR("format_up", "%ip", CFGF_NONE),
        CFG_STR("format_down", "no IPv6", CFGF_NONE),
        CFG_CUSTOM_ALIGN_OPT,
        CFG_CUSTOM_COLOR_OPTS,
        CFG_CUSTOM_MIN_WIDTH_OPT,
        CFG_CUSTOM_SEPARATOR_OPT,
        CFG_CUSTOM_SEP_BLOCK_WIDTH_OPT,
        CFG_END()};

    cfg_opt_t battery_opts[] = {
        CFG_STR("format", "%status %percentage %remaining", CFGF_NONE),
        CFG_STR("format_down", "No battery", CFGF_NONE),
        CFG_STR("status_chr", "CHR", CFGF_NONE),
        CFG_STR("status_bat", "BAT", CFGF_NONE),
        CFG_STR("status_full", "FULL", CFGF_NONE),
        CFG_STR("path", "/sys/class/power_supply/BAT%d/uevent", CFGF_NONE),
        CFG_INT("low_threshold", 30, CFGF_NONE),
        CFG_STR("threshold_type", "time", CFGF_NONE),
        CFG_BOOL("last_full_capacity", false, CFGF_NONE),
        CFG_BOOL("integer_battery_capacity", false, CFGF_NONE),
        CFG_BOOL("hide_seconds", false, CFGF_NONE),
        CFG_CUSTOM_ALIGN_OPT,
        CFG_CUSTOM_COLOR_OPTS,
        CFG_CUSTOM_MIN_WIDTH_OPT,
        CFG_CUSTOM_SEPARATOR_OPT,
        CFG_CUSTOM_SEP_BLOCK_WIDTH_OPT,
        CFG_END()};

    cfg_opt_t time_opts[] = {
        CFG_STR("format", "%Y-%m-%d %H:%M:%S", CFGF_NONE),
        CFG_CUSTOM_ALIGN_OPT,
        CFG_CUSTOM_MIN_WIDTH_OPT,
        CFG_CUSTOM_SEPARATOR_OPT,
        CFG_CUSTOM_SEP_BLOCK_WIDTH_OPT,
        CFG_END()};

    cfg_opt_t tztime_opts[] = {
        CFG_STR("format", "%Y-%m-%d %H:%M:%S %Z", CFGF_NONE),
        CFG_STR("timezone", "", CFGF_NONE),
        CFG_STR("format_time", NULL, CFGF_NONE),
        CFG_CUSTOM_ALIGN_OPT,
        CFG_CUSTOM_MIN_WIDTH_OPT,
        CFG_CUSTOM_SEPARATOR_OPT,
        CFG_CUSTOM_SEP_BLOCK_WIDTH_OPT,
        CFG_END()};

    cfg_opt_t ddate_opts[] = {
        CFG_STR("format", "%{%a, %b %d%}, %Y%N - %H", CFGF_NONE),
        CFG_CUSTOM_ALIGN_OPT,
        CFG_CUSTOM_MIN_WIDTH_OPT,
        CFG_CUSTOM_SEPARATOR_OPT,
        CFG_CUSTOM_SEP_BLOCK_WIDTH_OPT,
        CFG_END()};

    cfg_opt_t load_opts[] = {
        CFG_STR("format", "%1min %5min %15min", CFGF_NONE),
        CFG_FLOAT("max_threshold", 5, CFGF_NONE),
        CFG_CUSTOM_ALIGN_OPT,
        CFG_CUSTOM_COLOR_OPTS,
        CFG_CUSTOM_MIN_WIDTH_OPT,
        CFG_CUSTOM_SEPARATOR_OPT,
        CFG_CUSTOM_SEP_BLOCK_WIDTH_OPT,
        CFG_END()};

    cfg_opt_t usage_opts[] = {
        CFG_STR("format", "%usage", CFGF_NONE),
        CFG_CUSTOM_ALIGN_OPT,
        CFG_CUSTOM_MIN_WIDTH_OPT,
        CFG_CUSTOM_SEPARATOR_OPT,
        CFG_CUSTOM_SEP_BLOCK_WIDTH_OPT,
        CFG_END()};

    cfg_opt_t temp_opts[] = {
        CFG_STR("format", "%degrees C", CFGF_NONE),
        CFG_STR("path", NULL, CFGF_NONE),
        CFG_INT("max_threshold", 75, CFGF_NONE),
        CFG_CUSTOM_ALIGN_OPT,
        CFG_CUSTOM_COLOR_OPTS,
        CFG_CUSTOM_MIN_WIDTH_OPT,
        CFG_CUSTOM_SEPARATOR_OPT,
        CFG_CUSTOM_SEP_BLOCK_WIDTH_OPT,
        CFG_END()};

    cfg_opt_t disk_opts[] = {
        CFG_STR("format", "%free", CFGF_NONE),
        CFG_STR("format_not_mounted", NULL, CFGF_NONE),
        CFG_STR("prefix_type", "binary", CFGF_NONE),
        CFG_STR("threshold_type", "percentage_avail", CFGF_NONE),
        CFG_FLOAT("low_threshold", 0, CFGF_NONE),
        CFG_CUSTOM_ALIGN_OPT,
        CFG_CUSTOM_COLOR_OPTS,
        CFG_CUSTOM_MIN_WIDTH_OPT,
        CFG_CUSTOM_SEPARATOR_OPT,
        CFG_CUSTOM_SEP_BLOCK_WIDTH_OPT,
        CFG_END()};

    cfg_opt_t volume_opts[] = {
        CFG_STR("format", "♪: %volume", CFGF_NONE),
        CFG_STR("format_muted", "♪: 0%%", CFGF_NONE),
        CFG_STR("device", "default", CFGF_NONE),
        CFG_STR("mixer", "Master", CFGF_NONE),
        CFG_INT("mixer_idx", 0, CFGF_NONE),
        CFG_CUSTOM_ALIGN_OPT,
        CFG_CUSTOM_COLOR_OPTS,
        CFG_CUSTOM_MIN_WIDTH_OPT,
        CFG_CUSTOM_SEPARATOR_OPT,
        CFG_CUSTOM_SEP_BLOCK_WIDTH_OPT,
        CFG_END()};

    cfg_opt_t opts[] = {
        CFG_STR_LIST("order", "{}", CFGF_NONE),
        CFG_SEC("general", general_opts, CFGF_NONE),
        CFG_SEC("run_watch", run_watch_opts, CFGF_TITLE | CFGF_MULTI),
        CFG_SEC("path_exists", path_exists_opts, CFGF_TITLE | CFGF_MULTI),
        CFG_SEC("wireless", wireless_opts, CFGF_TITLE | CFGF_MULTI),
        CFG_SEC("ethernet", ethernet_opts, CFGF_TITLE | CFGF_MULTI),
        CFG_SEC("battery", battery_opts, CFGF_TITLE | CFGF_MULTI),
        CFG_SEC("cpu_temperature", temp_opts, CFGF_TITLE | CFGF_MULTI),
        CFG_SEC("disk", disk_opts, CFGF_TITLE | CFGF_MULTI),
        CFG_SEC("volume", volume_opts, CFGF_TITLE | CFGF_MULTI),
        CFG_SEC("ipv6", ipv6_opts, CFGF_NONE),
        CFG_SEC("time", time_opts, CFGF_NONE),
        CFG_SEC("tztime", tztime_opts, CFGF_TITLE | CFGF_MULTI),
        CFG_SEC("ddate", ddate_opts, CFGF_NONE),
        CFG_SEC("load", load_opts, CFGF_NONE),
        CFG_SEC("cpu_usage", usage_opts, CFGF_NONE),
        CFG_END()};

    char *configfile = NULL;
    int o, option_index = 0;
    struct option long_options[] = {
        {"config", required_argument, 0, 'c'},
        {"help", no_argument, 0, 'h'},
        {"version", no_argument, 0, 'v'},
        {0, 0, 0, 0}};

    struct sigaction action;
    memset(&action, 0, sizeof(struct sigaction));
    action.sa_handler = fatalsig;
    main_thread = pthread_self();

    /* Exit upon SIGPIPE because when we have nowhere to write to, gathering system
     * information is pointless. Also exit explicitly on SIGTERM and SIGINT because
     * only this will trigger a reset of the cursor in the terminal output-format.
     */
    sigaction(SIGPIPE, &action, NULL);
    sigaction(SIGTERM, &action, NULL);
    sigaction(SIGINT, &action, NULL);

    memset(&action, 0, sizeof(struct sigaction));
    action.sa_handler = sigusr1;
    sigaction(SIGUSR1, &action, NULL);

    if (setlocale(LC_ALL, "") == NULL)
        die("Could not set locale. Please make sure all your LC_* / LANG settings are correct.");

    while ((o = getopt_long(argc, argv, "c:hv", long_options, &option_index)) != -1)
        if ((char)o == 'c')
            configfile = optarg;
        else if ((char)o == 'h') {
            printf("i3status " VERSION " © 2008 Michael Stapelberg and contributors\n"
                   "Syntax: %s [-c <configfile>] [-h] [-v]\n",
                   argv[0]);
            return 0;
        } else if ((char)o == 'v') {
            printf("i3status " VERSION " © 2008 Michael Stapelberg and contributors\n");
            return 0;
        }

    if (configfile == NULL)
        configfile = get_config_path();

    cfg = cfg_init(opts, CFGF_NOCASE);
    if (cfg_parse(cfg, configfile) == CFG_PARSE_ERROR)
        return EXIT_FAILURE;

    if (cfg_size(cfg, "order") == 0)
        die("Your 'order' array is empty. Please fix your config.\n");

    cfg_general = cfg_getsec(cfg, "general");
    if (cfg_general == NULL)
        die("Could not get section \"general\"\n");

    char *output_str = cfg_getstr(cfg_general, "output_format");
    if (strcasecmp(output_str, "auto") == 0) {
        fprintf(stderr, "i3status: trying to auto-detect output_format setting\n");
        output_str = auto_detect_format();
        if (!output_str) {
            output_str = "none";
            fprintf(stderr, "i3status: falling back to \"none\"\n");
        } else {
            fprintf(stderr, "i3status: auto-detected \"%s\"\n", output_str);
        }
    }

    if (strcasecmp(output_str, "dzen2") == 0)
        output_format = O_DZEN2;
    else if (strcasecmp(output_str, "xmobar") == 0)
        output_format = O_XMOBAR;
    else if (strcasecmp(output_str, "i3bar") == 0)
        output_format = O_I3BAR;
    else if (strcasecmp(output_str, "lemonbar") == 0)
        output_format = O_LEMONBAR;
    else if (strcasecmp(output_str, "term") == 0)
        output_format = O_TERM;
    else if (strcasecmp(output_str, "none") == 0)
        output_format = O_NONE;
    else
        die("Unknown output format: \"%s\"\n", output_str);

    const char *separator = cfg_getstr(cfg_general, "separator");

    /* lemonbar needs % to be escaped with another % */
    pct_mark = (output_format == O_LEMONBAR) ? "%%" : "%";

    // if no custom separator has been provided, use the default one
    if (strcasecmp(separator, "default") == 0)
        separator = get_default_separator();

    if (!valid_color(cfg_getstr(cfg_general, "color_good")) || !valid_color(cfg_getstr(cfg_general, "color_degraded")) || !valid_color(cfg_getstr(cfg_general, "color_bad")) || !valid_color(cfg_getstr(cfg_general, "color_separator")))
        die("Bad color format");

    char *markup_str = cfg_getstr(cfg_general, "markup");
    if (strcasecmp(markup_str, "pango") == 0)
        markup_format = M_PANGO;
    else if (strcasecmp(markup_str, "none") == 0)
        markup_format = M_NONE;
    else
        die("Unknown markup format: \"%s\"\n", markup_str);

#if YAJL_MAJOR >= 2
    yajl_gen json_gen = yajl_gen_alloc(NULL);
#else
    yajl_gen json_gen = yajl_gen_alloc(NULL, NULL);
#endif

    if (output_format == O_I3BAR) {
        /* Initialize the i3bar protocol. See i3/docs/i3bar-protocol
         * for details. */
        printf("{\"version\":1}\n[\n");
        fflush(stdout);
        yajl_gen_array_open(json_gen);
        yajl_gen_clear(json_gen);
    }
    if (output_format == O_TERM) {
        /* Save the cursor-position and hide the cursor */
        printf("\033[s\033[?25l");
        /* Undo at exit */
        atexit(&reset_cursor);
    }

    if ((general_socket = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
        die("Could not create socket\n");

    int interval = cfg_getint(cfg_general, "interval");

    /* One memory page which each plugin can use to buffer output.
     * Even though it’s unclean, we just assume that the user will not
     * specify a format string which expands to something longer than 4096
     * bytes — given that the output of i3status is used to display
     * information on screen, more than 1024 characters for the full line
     * (!), not individual plugins, seem very unlikely. */
    char buffer[4096];

    void **per_instance = calloc(cfg_size(cfg, "order"), sizeof(*per_instance));

    while (1) {
        if (exit_upon_signal) {
            fprintf(stderr, "Exiting due to signal.\n");
            exit(1);
        }
        struct timeval tv;
        gettimeofday(&tv, NULL);
        if (output_format == O_I3BAR)
            yajl_gen_array_open(json_gen);
        else if (output_format == O_TERM)
            /* Restore the cursor-position, clear line */
            printf("\033[u\033[K");
        for (j = 0; j < cfg_size(cfg, "order"); j++) {
            cur_instance = per_instance + j;
            if (j > 0)
                print_separator(separator);

            const char *current = cfg_getnstr(cfg, "order", j);

            CASE_SEC("ipv6") {
                SEC_OPEN_MAP("ipv6");
                print_ipv6_info(json_gen, buffer, cfg_getstr(sec, "format_up"), cfg_getstr(sec, "format_down"));
                SEC_CLOSE_MAP;
            }

            CASE_SEC_TITLE("wireless") {
                SEC_OPEN_MAP("wireless");
                const char *interface = NULL;
                if (strcasecmp(title, "_first_") == 0)
                    interface = first_eth_interface(NET_TYPE_WIRELESS);
                if (interface == NULL)
                    interface = title;
                print_wireless_info(json_gen, buffer, interface, cfg_getstr(sec, "format_up"), cfg_getstr(sec, "format_down"));
                SEC_CLOSE_MAP;
            }

            CASE_SEC_TITLE("ethernet") {
                SEC_OPEN_MAP("ethernet");
                const char *interface = NULL;
                if (strcasecmp(title, "_first_") == 0)
                    interface = first_eth_interface(NET_TYPE_ETHERNET);
                if (interface == NULL)
                    interface = title;
                print_eth_info(json_gen, buffer, interface, cfg_getstr(sec, "format_up"), cfg_getstr(sec, "format_down"));
                SEC_CLOSE_MAP;
            }

            CASE_SEC_TITLE("battery") {
                SEC_OPEN_MAP("battery");
                print_battery_info(json_gen, buffer, atoi(title), cfg_getstr(sec, "path"), cfg_getstr(sec, "format"), cfg_getstr(sec, "format_down"), cfg_getstr(sec, "status_chr"), cfg_getstr(sec, "status_bat"), cfg_getstr(sec, "status_full"), cfg_getint(sec, "low_threshold"), cfg_getstr(sec, "threshold_type"), cfg_getbool(sec, "last_full_capacity"), cfg_getbool(sec, "integer_battery_capacity"), cfg_getbool(sec, "hide_seconds"));
                SEC_CLOSE_MAP;
            }

            CASE_SEC_TITLE("run_watch") {
                SEC_OPEN_MAP("run_watch");
                print_run_watch(json_gen, buffer, title, cfg_getstr(sec, "pidfile"), cfg_getstr(sec, "format"), cfg_getstr(sec, "format_down"));
                SEC_CLOSE_MAP;
            }

            CASE_SEC_TITLE("path_exists") {
                SEC_OPEN_MAP("path_exists");
                print_path_exists(json_gen, buffer, title, cfg_getstr(sec, "path"), cfg_getstr(sec, "format"), cfg_getstr(sec, "format_down"));
                SEC_CLOSE_MAP;
            }

            CASE_SEC_TITLE("disk") {
                SEC_OPEN_MAP("disk_info");
                print_disk_info(json_gen, buffer, title, cfg_getstr(sec, "format"), cfg_getstr(sec, "format_not_mounted"), cfg_getstr(sec, "prefix_type"), cfg_getstr(sec, "threshold_type"), cfg_getfloat(sec, "low_threshold"));
                SEC_CLOSE_MAP;
            }

            CASE_SEC("load") {
                SEC_OPEN_MAP("load");
                print_load(json_gen, buffer, cfg_getstr(sec, "format"), cfg_getfloat(sec, "max_threshold"));
                SEC_CLOSE_MAP;
            }

            CASE_SEC("time") {
                SEC_OPEN_MAP("time");
                print_time(json_gen, buffer, NULL, cfg_getstr(sec, "format"), NULL, NULL, tv.tv_sec);
                SEC_CLOSE_MAP;
            }

            CASE_SEC_TITLE("tztime") {
                SEC_OPEN_MAP("tztime");
                print_time(json_gen, buffer, title, cfg_getstr(sec, "format"), cfg_getstr(sec, "timezone"), cfg_getstr(sec, "format_time"), tv.tv_sec);
                SEC_CLOSE_MAP;
            }

            CASE_SEC("ddate") {
                SEC_OPEN_MAP("ddate");
                print_ddate(json_gen, buffer, cfg_getstr(sec, "format"), tv.tv_sec);
                SEC_CLOSE_MAP;
            }

            CASE_SEC_TITLE("volume") {
                SEC_OPEN_MAP("volume");
                print_volume(json_gen, buffer, cfg_getstr(sec, "format"),
                             cfg_getstr(sec, "format_muted"),
                             cfg_getstr(sec, "device"),
                             cfg_getstr(sec, "mixer"),
                             cfg_getint(sec, "mixer_idx"));
                SEC_CLOSE_MAP;
            }

            CASE_SEC_TITLE("cpu_temperature") {
                SEC_OPEN_MAP("cpu_temperature");
                print_cpu_temperature_info(json_gen, buffer, atoi(title), cfg_getstr(sec, "path"), cfg_getstr(sec, "format"), cfg_getint(sec, "max_threshold"));
                SEC_CLOSE_MAP;
            }

            CASE_SEC("cpu_usage") {
                SEC_OPEN_MAP("cpu_usage");
                print_cpu_usage(json_gen, buffer, cfg_getstr(sec, "format"));
                SEC_CLOSE_MAP;
            }
        }
        if (output_format == O_I3BAR) {
            yajl_gen_array_close(json_gen);
            const unsigned char *buf;
#if YAJL_MAJOR >= 2
            size_t len;
#else
            unsigned int len;
#endif
            yajl_gen_get_buf(json_gen, &buf, &len);
            write(STDOUT_FILENO, buf, len);
            yajl_gen_clear(json_gen);
        }

        printf("\n");
        fflush(stdout);

        /* To provide updates on every full second (as good as possible)
         * we don’t use sleep(interval) but we sleep until the next
         * second (with microsecond precision) plus (interval-1)
         * seconds. We also align to 60 seconds modulo interval such
         * that we start with :00 on every new minute. */
        struct timeval current_timeval;
        gettimeofday(&current_timeval, NULL);
        struct timespec ts = {interval - 1 - (current_timeval.tv_sec % interval), (10e5 - current_timeval.tv_usec) * 1000};
        nanosleep(&ts, NULL);
    }
}