4 * i3status – Generates a status line for dzen2 or xmobar
6 * Copyright © 2008-2012 Michael Stapelberg and contributors
7 * Copyright © 2009 Thorsten Toepper <atsutane at freethoughts dot de>
8 * Copyright © 2010 Axel Wagner <mail at merovius dot de>
9 * Copyright © 2010 Fernando Tarlá Cardoso Lemos <fernandotcl at gmail dot com>
11 * See file LICENSE for license information.
20 #include <sys/socket.h>
21 #include <netinet/in.h>
27 #include <sys/types.h>
32 #include <yajl/yajl_gen.h>
33 #include <yajl/yajl_version.h>
37 #define exit_if_null(pointer, ...) { if (pointer == NULL) die(__VA_ARGS__); }
39 #define CFG_CUSTOM_ALIGN_OPT \
40 CFG_STR_CB("align", NULL, CFGF_NONE, parse_align)
42 #define CFG_COLOR_OPTS(good, degraded, bad) \
43 CFG_STR("color_good", good, CFGF_NONE), \
44 CFG_STR("color_degraded", degraded, CFGF_NONE), \
45 CFG_STR("color_bad", bad, CFGF_NONE)
47 #define CFG_CUSTOM_COLOR_OPTS CFG_COLOR_OPTS(NULL, NULL, NULL)
49 #define CFG_CUSTOM_MIN_WIDTH_OPT \
50 CFG_PTR_CB("min_width", NULL, CFGF_NONE, parse_min_width, free)
52 /* socket file descriptor for general purposes */
55 static bool exit_upon_signal = false;
57 cfg_t *cfg, *cfg_general, *cfg_section;
62 * Set the exit_upon_signal flag, because one cannot do anything in a safe
63 * manner in a signal handler (e.g. fprintf, which we really want to do for
64 * debugging purposes), see
65 * https://www.securecoding.cert.org/confluence/display/seccode/SIG30-C.+Call+only+asynchronous-safe+functions+within+signal+handlers
68 void fatalsig(int signum) {
69 exit_upon_signal = true;
73 * Do nothing upon SIGUSR1. Running this signal handler will nevertheless
74 * interrupt nanosleep() so that i3status immediately generates new output.
77 void sigusr1(int signum) {
81 * Checks if the given path exists by calling stat().
84 static bool path_exists(const char *path) {
86 return (stat(path, &buf) == 0);
89 static void *scalloc(size_t size) {
90 void *result = calloc(size, 1);
91 exit_if_null(result, "Error: out of memory (calloc(%zd))\n", size);
95 static char *sstrdup(const char *str) {
96 char *result = strdup(str);
97 exit_if_null(result, "Error: out of memory (strdup())\n");
102 * Parses the "align" module option (to validate input).
104 static int parse_align(cfg_t *context, cfg_opt_t *option, const char *value, void *result) {
105 if (strcasecmp(value, "left") != 0 && strcasecmp(value,"right") != 0 && strcasecmp(value, "center") != 0)
106 die("Invalid alignment attribute found in section %s, line %d: \"%s\"\n"
107 "Valid attributes are: left, center, right\n", context->name, context->line, value);
109 const char **cresult = result;
116 * Parses the "min_width" module option whose value can either be a string or an integer.
118 static int parse_min_width(cfg_t *context, cfg_opt_t *option, const char *value, void *result) {
120 long num = strtol(value, &end, 10);
123 die("Invalid min_width attribute found in section %s, line %d: %d\n"
124 "Expected positive integer or string\n", context->name, context->line, num);
125 else if (num == LONG_MIN || num == LONG_MAX || (end && *end != '\0'))
128 if (strlen(value) == 0)
129 die("Empty min_width attribute found in section %s, line %d\n"
130 "Expected positive integer or non-empty string\n", context->name, context->line);
132 if (strcmp(value, "0") == 0)
133 die("Invalid min_width attribute found in section %s, line %d: \"%s\"\n"
134 "Expected positive integer or string\n", context->name, context->line, value);
136 struct min_width *parsed = scalloc(sizeof(struct min_width));
139 /* num is preferred, but if it’s 0 (i.e. not valid), store and use
140 * the raw string value */
142 parsed->str = sstrdup(value);
144 struct min_width **cresult = result;
151 * Validates a color in "#RRGGBB" format
154 static int valid_color(const char *value)
156 if (strlen(value) != 7) return 0;
157 if (value[0] != '#') return 0;
158 for (int i = 1; i < 7; ++i) {
159 if (value[i] >= '0' && value[i] <= '9') continue;
160 if (value[i] >= 'a' && value[i] <= 'f') continue;
161 if (value[i] >= 'A' && value[i] <= 'F') continue;
168 * This function resolves ~ in pathnames.
169 * It may resolve wildcards in the first part of the path, but if no match
170 * or multiple matches are found, it just returns a copy of path as given.
173 static char *resolve_tilde(const char *path) {
174 static glob_t globbuf;
175 char *head, *tail, *result = NULL;
177 tail = strchr(path, '/');
178 head = strndup(path, tail ? (size_t)(tail - path) : strlen(path));
180 int res = glob(head, GLOB_TILDE, NULL, &globbuf);
182 /* no match, or many wildcard matches are bad */
183 if (res == GLOB_NOMATCH || globbuf.gl_pathc != 1)
184 result = sstrdup(path);
186 die("glob() failed");
188 head = globbuf.gl_pathv[0];
189 result = scalloc(strlen(head) + (tail ? strlen(tail) : 0) + 1);
190 strncpy(result, head, strlen(head));
192 strncat(result, tail, strlen(tail));
199 static char *get_config_path(void) {
200 char *xdg_config_home, *xdg_config_dirs, *config_path;
202 /* 1: check the traditional path under the home directory */
203 config_path = resolve_tilde("~/.i3status.conf");
204 if (path_exists(config_path))
207 /* 2: check for $XDG_CONFIG_HOME/i3status/config */
208 if ((xdg_config_home = getenv("XDG_CONFIG_HOME")) == NULL)
209 xdg_config_home = "~/.config";
211 xdg_config_home = resolve_tilde(xdg_config_home);
212 if (asprintf(&config_path, "%s/i3status/config", xdg_config_home) == -1)
213 die("asprintf() failed");
214 free(xdg_config_home);
216 if (path_exists(config_path))
220 /* 3: check the traditional path under /etc */
221 config_path = SYSCONFDIR "/i3status.conf";
222 if (path_exists(config_path))
223 return sstrdup(config_path);
225 /* 4: check for $XDG_CONFIG_DIRS/i3status/config */
226 if ((xdg_config_dirs = getenv("XDG_CONFIG_DIRS")) == NULL)
227 xdg_config_dirs = "/etc/xdg";
229 char *buf = strdup(xdg_config_dirs);
230 char *tok = strtok(buf, ":");
231 while (tok != NULL) {
232 tok = resolve_tilde(tok);
233 if (asprintf(&config_path, "%s/i3status/config", tok) == -1)
234 die("asprintf() failed");
236 if (path_exists(config_path)) {
241 tok = strtok(NULL, ":");
245 die("Unable to find the configuration file (looked at "
246 "~/.i3status.conf, $XDG_CONFIG_HOME/i3status/config, "
247 "/etc/i3status.conf and $XDG_CONFIG_DIRS/i3status/config)");
252 * Returns the default separator to use if no custom separator has been specified.
254 static char *get_default_separator() {
255 if (output_format == O_DZEN2)
256 return "^p(5;-2)^ro(2)^p()^p(5)";
257 if (output_format == O_I3BAR)
258 // anything besides the empty string indicates that the default separator should be used
263 int main(int argc, char *argv[]) {
266 cfg_opt_t general_opts[] = {
267 CFG_STR("output_format", "auto", CFGF_NONE),
268 CFG_BOOL("colors", 1, CFGF_NONE),
269 CFG_STR("separator", "default", CFGF_NONE),
270 CFG_STR("color_separator", "#333333", CFGF_NONE),
271 CFG_INT("interval", 1, CFGF_NONE),
272 CFG_COLOR_OPTS("#00FF00", "#FFFF00", "#FF0000"),
276 cfg_opt_t run_watch_opts[] = {
277 CFG_STR("pidfile", NULL, CFGF_NONE),
278 CFG_STR("format", "%title: %status", CFGF_NONE),
279 CFG_CUSTOM_ALIGN_OPT,
280 CFG_CUSTOM_COLOR_OPTS,
281 CFG_CUSTOM_MIN_WIDTH_OPT,
285 cfg_opt_t path_exists_opts[] = {
286 CFG_STR("path", NULL, CFGF_NONE),
287 CFG_STR("format", "%title: %status", CFGF_NONE),
288 CFG_CUSTOM_ALIGN_OPT,
289 CFG_CUSTOM_COLOR_OPTS,
290 CFG_CUSTOM_MIN_WIDTH_OPT,
294 cfg_opt_t wireless_opts[] = {
295 CFG_STR("format_up", "W: (%quality at %essid, %bitrate) %ip", CFGF_NONE),
296 CFG_STR("format_down", "W: down", CFGF_NONE),
297 CFG_CUSTOM_ALIGN_OPT,
298 CFG_CUSTOM_COLOR_OPTS,
299 CFG_CUSTOM_MIN_WIDTH_OPT,
303 cfg_opt_t ethernet_opts[] = {
304 CFG_STR("format_up", "E: %ip (%speed)", CFGF_NONE),
305 CFG_STR("format_down", "E: down", CFGF_NONE),
306 CFG_CUSTOM_ALIGN_OPT,
307 CFG_CUSTOM_COLOR_OPTS,
308 CFG_CUSTOM_MIN_WIDTH_OPT,
312 cfg_opt_t ipv6_opts[] = {
313 CFG_STR("format_up", "%ip", CFGF_NONE),
314 CFG_STR("format_down", "no IPv6", CFGF_NONE),
315 CFG_CUSTOM_ALIGN_OPT,
316 CFG_CUSTOM_COLOR_OPTS,
317 CFG_CUSTOM_MIN_WIDTH_OPT,
321 cfg_opt_t battery_opts[] = {
322 CFG_STR("format", "%status %percentage %remaining", CFGF_NONE),
323 CFG_STR("format_down", "No battery", CFGF_NONE),
324 CFG_STR("status_chr", "CHR", CFGF_NONE),
325 CFG_STR("status_bat", "BAT", CFGF_NONE),
326 CFG_STR("status_full", "FULL", CFGF_NONE),
327 CFG_STR("path", "/sys/class/power_supply/BAT%d/uevent", CFGF_NONE),
328 CFG_INT("low_threshold", 30, CFGF_NONE),
329 CFG_STR("threshold_type", "time", CFGF_NONE),
330 CFG_BOOL("last_full_capacity", false, CFGF_NONE),
331 CFG_BOOL("integer_battery_capacity", false, CFGF_NONE),
332 CFG_BOOL("hide_seconds", false, CFGF_NONE),
333 CFG_CUSTOM_ALIGN_OPT,
334 CFG_CUSTOM_COLOR_OPTS,
335 CFG_CUSTOM_MIN_WIDTH_OPT,
339 cfg_opt_t time_opts[] = {
340 CFG_STR("format", "%Y-%m-%d %H:%M:%S", CFGF_NONE),
341 CFG_CUSTOM_ALIGN_OPT,
342 CFG_CUSTOM_MIN_WIDTH_OPT,
346 cfg_opt_t tztime_opts[] = {
347 CFG_STR("format", "%Y-%m-%d %H:%M:%S %Z", CFGF_NONE),
348 CFG_STR("timezone", "", CFGF_NONE),
349 CFG_CUSTOM_ALIGN_OPT,
350 CFG_CUSTOM_MIN_WIDTH_OPT,
354 cfg_opt_t ddate_opts[] = {
355 CFG_STR("format", "%{%a, %b %d%}, %Y%N - %H", CFGF_NONE),
356 CFG_CUSTOM_ALIGN_OPT,
357 CFG_CUSTOM_MIN_WIDTH_OPT,
361 cfg_opt_t load_opts[] = {
362 CFG_STR("format", "%1min %5min %15min", CFGF_NONE),
363 CFG_FLOAT("max_threshold", 5, CFGF_NONE),
364 CFG_CUSTOM_ALIGN_OPT,
365 CFG_CUSTOM_COLOR_OPTS,
366 CFG_CUSTOM_MIN_WIDTH_OPT,
370 cfg_opt_t usage_opts[] = {
371 CFG_STR("format", "%usage", CFGF_NONE),
372 CFG_CUSTOM_ALIGN_OPT,
373 CFG_CUSTOM_MIN_WIDTH_OPT,
377 cfg_opt_t temp_opts[] = {
378 CFG_STR("format", "%degrees C", CFGF_NONE),
379 CFG_STR("path", NULL, CFGF_NONE),
380 CFG_INT("max_threshold", 75, CFGF_NONE),
381 CFG_CUSTOM_ALIGN_OPT,
382 CFG_CUSTOM_COLOR_OPTS,
383 CFG_CUSTOM_MIN_WIDTH_OPT,
387 cfg_opt_t disk_opts[] = {
388 CFG_STR("format", "%free", CFGF_NONE),
389 CFG_STR("prefix_type", "binary", CFGF_NONE),
390 CFG_STR("threshold_type", "percentage_avail", CFGF_NONE),
391 CFG_FLOAT("low_threshold", 0, CFGF_NONE),
392 CFG_CUSTOM_ALIGN_OPT,
393 CFG_CUSTOM_COLOR_OPTS,
394 CFG_CUSTOM_MIN_WIDTH_OPT,
398 cfg_opt_t volume_opts[] = {
399 CFG_STR("format", "♪: %volume", CFGF_NONE),
400 CFG_STR("format_muted", "♪: 0%%", CFGF_NONE),
401 CFG_STR("device", "default", CFGF_NONE),
402 CFG_STR("mixer", "Master", CFGF_NONE),
403 CFG_INT("mixer_idx", 0, CFGF_NONE),
404 CFG_CUSTOM_ALIGN_OPT,
405 CFG_CUSTOM_COLOR_OPTS,
406 CFG_CUSTOM_MIN_WIDTH_OPT,
411 CFG_STR_LIST("order", "{}", CFGF_NONE),
412 CFG_SEC("general", general_opts, CFGF_NONE),
413 CFG_SEC("run_watch", run_watch_opts, CFGF_TITLE | CFGF_MULTI),
414 CFG_SEC("path_exists", path_exists_opts, CFGF_TITLE | CFGF_MULTI),
415 CFG_SEC("wireless", wireless_opts, CFGF_TITLE | CFGF_MULTI),
416 CFG_SEC("ethernet", ethernet_opts, CFGF_TITLE | CFGF_MULTI),
417 CFG_SEC("battery", battery_opts, CFGF_TITLE | CFGF_MULTI),
418 CFG_SEC("cpu_temperature", temp_opts, CFGF_TITLE | CFGF_MULTI),
419 CFG_SEC("disk", disk_opts, CFGF_TITLE | CFGF_MULTI),
420 CFG_SEC("volume", volume_opts, CFGF_TITLE | CFGF_MULTI),
421 CFG_SEC("ipv6", ipv6_opts, CFGF_NONE),
422 CFG_SEC("time", time_opts, CFGF_NONE),
423 CFG_SEC("tztime", tztime_opts, CFGF_TITLE | CFGF_MULTI),
424 CFG_SEC("ddate", ddate_opts, CFGF_NONE),
425 CFG_SEC("load", load_opts, CFGF_NONE),
426 CFG_SEC("cpu_usage", usage_opts, CFGF_NONE),
430 char *configfile = NULL;
431 int o, option_index = 0;
432 struct option long_options[] = {
433 {"config", required_argument, 0, 'c'},
434 {"help", no_argument, 0, 'h'},
435 {"version", no_argument, 0, 'v'},
439 struct sigaction action;
440 memset(&action, 0, sizeof(struct sigaction));
441 action.sa_handler = fatalsig;
443 /* Exit upon SIGPIPE because when we have nowhere to write to, gathering system
444 * information is pointless. Also exit explicitly on SIGTERM and SIGINT because
445 * only this will trigger a reset of the cursor in the terminal output-format.
447 sigaction(SIGPIPE, &action, NULL);
448 sigaction(SIGTERM, &action, NULL);
449 sigaction(SIGINT, &action, NULL);
451 memset(&action, 0, sizeof(struct sigaction));
452 action.sa_handler = sigusr1;
453 sigaction(SIGUSR1, &action, NULL);
455 if (setlocale(LC_ALL, "") == NULL)
456 die("Could not set locale. Please make sure all your LC_* / LANG settings are correct.");
458 while ((o = getopt_long(argc, argv, "c:hv", long_options, &option_index)) != -1)
461 else if ((char)o == 'h') {
462 printf("i3status " VERSION " © 2008-2012 Michael Stapelberg and contributors\n"
463 "Syntax: %s [-c <configfile>] [-h] [-v]\n", argv[0]);
465 } else if ((char)o == 'v') {
466 printf("i3status " VERSION " © 2008-2012 Michael Stapelberg and contributors\n");
471 if (configfile == NULL)
472 configfile = get_config_path();
474 cfg = cfg_init(opts, CFGF_NOCASE);
475 if (cfg_parse(cfg, configfile) == CFG_PARSE_ERROR)
478 if (cfg_size(cfg, "order") == 0)
479 die("Your 'order' array is empty. Please fix your config.\n");
481 cfg_general = cfg_getsec(cfg, "general");
482 if (cfg_general == NULL)
483 die("Could not get section \"general\"\n");
485 char *output_str = cfg_getstr(cfg_general, "output_format");
486 if (strcasecmp(output_str, "auto") == 0) {
487 fprintf(stderr, "i3status: trying to auto-detect output_format setting\n");
488 output_str = auto_detect_format();
491 fprintf(stderr, "i3status: falling back to \"none\"\n");
493 fprintf(stderr, "i3status: auto-detected \"%s\"\n", output_str);
497 if (strcasecmp(output_str, "dzen2") == 0)
498 output_format = O_DZEN2;
499 else if (strcasecmp(output_str, "xmobar") == 0)
500 output_format = O_XMOBAR;
501 else if (strcasecmp(output_str, "i3bar") == 0)
502 output_format = O_I3BAR;
503 else if (strcasecmp(output_str, "term") == 0)
504 output_format = O_TERM;
505 else if (strcasecmp(output_str, "none") == 0)
506 output_format = O_NONE;
507 else die("Unknown output format: \"%s\"\n", output_str);
509 const char *separator = cfg_getstr(cfg_general, "separator");
511 // if no custom separator has been provided, use the default one
512 if (strcasecmp(separator, "default") == 0)
513 separator = get_default_separator();
515 if (!valid_color(cfg_getstr(cfg_general, "color_good"))
516 || !valid_color(cfg_getstr(cfg_general, "color_degraded"))
517 || !valid_color(cfg_getstr(cfg_general, "color_bad"))
518 || !valid_color(cfg_getstr(cfg_general, "color_separator")))
519 die("Bad color format");
522 yajl_gen json_gen = yajl_gen_alloc(NULL);
524 yajl_gen json_gen = yajl_gen_alloc(NULL, NULL);
527 if (output_format == O_I3BAR) {
528 /* Initialize the i3bar protocol. See i3/docs/i3bar-protocol
530 printf("{\"version\":1}\n[\n");
532 yajl_gen_array_open(json_gen);
533 yajl_gen_clear(json_gen);
535 if (output_format == O_TERM) {
536 /* Save the cursor-position and hide the cursor */
537 printf("\033[s\033[?25l");
539 atexit(&reset_cursor);
542 if ((general_socket = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
543 die("Could not create socket\n");
545 int interval = cfg_getint(cfg_general, "interval");
547 /* One memory page which each plugin can use to buffer output.
548 * Even though it’s unclean, we just assume that the user will not
549 * specify a format string which expands to something longer than 4096
550 * bytes — given that the output of i3status is used to display
551 * information on screen, more than 1024 characters for the full line
552 * (!), not individual plugins, seem very unlikely. */
555 void **per_instance = calloc(cfg_size(cfg, "order"), sizeof(*per_instance));
558 if (exit_upon_signal) {
559 fprintf(stderr, "Exiting due to signal.\n");
563 gettimeofday(&tv, NULL);
564 if (output_format == O_I3BAR)
565 yajl_gen_array_open(json_gen);
566 else if (output_format == O_TERM)
567 /* Restore the cursor-position, clear line */
568 printf("\033[u\033[K");
569 for (j = 0; j < cfg_size(cfg, "order"); j++) {
570 cur_instance = per_instance + j;
572 print_separator(separator);
574 const char *current = cfg_getnstr(cfg, "order", j);
577 SEC_OPEN_MAP("ipv6");
578 print_ipv6_info(json_gen, buffer, cfg_getstr(sec, "format_up"), cfg_getstr(sec, "format_down"));
582 CASE_SEC_TITLE("wireless") {
583 SEC_OPEN_MAP("wireless");
584 const char *interface = NULL;
585 if (strcasecmp(title, "_first_") == 0)
586 interface = first_eth_interface(NET_TYPE_WIRELESS);
587 if (interface == NULL)
589 print_wireless_info(json_gen, buffer, interface, cfg_getstr(sec, "format_up"), cfg_getstr(sec, "format_down"));
593 CASE_SEC_TITLE("ethernet") {
594 SEC_OPEN_MAP("ethernet");
595 const char *interface = NULL;
596 if (strcasecmp(title, "_first_") == 0)
597 interface = first_eth_interface(NET_TYPE_ETHERNET);
598 if (interface == NULL)
600 print_eth_info(json_gen, buffer, interface, cfg_getstr(sec, "format_up"), cfg_getstr(sec, "format_down"));
604 CASE_SEC_TITLE("battery") {
605 SEC_OPEN_MAP("battery");
606 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"));
610 CASE_SEC_TITLE("run_watch") {
611 SEC_OPEN_MAP("run_watch");
612 print_run_watch(json_gen, buffer, title, cfg_getstr(sec, "pidfile"), cfg_getstr(sec, "format"));
616 CASE_SEC_TITLE("path_exists") {
617 SEC_OPEN_MAP("path_exists");
618 print_path_exists(json_gen, buffer, title, cfg_getstr(sec, "path"), cfg_getstr(sec, "format"));
622 CASE_SEC_TITLE("disk") {
623 SEC_OPEN_MAP("disk_info");
624 print_disk_info(json_gen, buffer, title, cfg_getstr(sec, "format"), cfg_getstr(sec, "prefix_type"), cfg_getstr(sec, "threshold_type"), cfg_getfloat(sec, "low_threshold"));
629 SEC_OPEN_MAP("load");
630 print_load(json_gen, buffer, cfg_getstr(sec, "format"), cfg_getfloat(sec, "max_threshold"));
635 SEC_OPEN_MAP("time");
636 print_time(json_gen, buffer, cfg_getstr(sec, "format"), NULL, tv.tv_sec);
640 CASE_SEC_TITLE("tztime") {
641 SEC_OPEN_MAP("tztime");
642 print_time(json_gen, buffer, cfg_getstr(sec, "format"), cfg_getstr(sec, "timezone"), tv.tv_sec);
647 SEC_OPEN_MAP("ddate");
648 print_ddate(json_gen, buffer, cfg_getstr(sec, "format"), tv.tv_sec);
652 CASE_SEC_TITLE("volume") {
653 SEC_OPEN_MAP("volume");
654 print_volume(json_gen, buffer, cfg_getstr(sec, "format"),
655 cfg_getstr(sec, "format_muted"),
656 cfg_getstr(sec, "device"),
657 cfg_getstr(sec, "mixer"),
658 cfg_getint(sec, "mixer_idx"));
662 CASE_SEC_TITLE("cpu_temperature") {
663 SEC_OPEN_MAP("cpu_temperature");
664 print_cpu_temperature_info(json_gen, buffer, atoi(title), cfg_getstr(sec, "path"), cfg_getstr(sec, "format"), cfg_getint(sec, "max_threshold"));
668 CASE_SEC("cpu_usage") {
669 SEC_OPEN_MAP("cpu_usage");
670 print_cpu_usage(json_gen, buffer, cfg_getstr(sec, "format"));
674 if (output_format == O_I3BAR) {
675 yajl_gen_array_close(json_gen);
676 const unsigned char *buf;
682 yajl_gen_get_buf(json_gen, &buf, &len);
683 write(STDOUT_FILENO, buf, len);
684 yajl_gen_clear(json_gen);
690 /* To provide updates on every full second (as good as possible)
691 * we don’t use sleep(interval) but we sleep until the next
692 * second (with microsecond precision) plus (interval-1)
693 * seconds. We also align to 60 seconds modulo interval such
694 * that we start with :00 on every new minute. */
695 struct timeval current_timeval;
696 gettimeofday(¤t_timeval, NULL);
697 struct timespec ts = {interval - 1 - (current_timeval.tv_sec % interval), (10e5 - current_timeval.tv_usec) * 1000};
698 nanosleep(&ts, NULL);