2 * vim:ts=4:sw=4:expandtab
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, ...) \
39 if (pointer == NULL) \
43 #define CFG_CUSTOM_ALIGN_OPT \
44 CFG_STR_CB("align", NULL, CFGF_NONE, parse_align)
46 #define CFG_COLOR_OPTS(good, degraded, bad) \
47 CFG_STR("color_good", good, CFGF_NONE), \
48 CFG_STR("color_degraded", degraded, CFGF_NONE), \
49 CFG_STR("color_bad", bad, CFGF_NONE)
51 #define CFG_CUSTOM_COLOR_OPTS CFG_COLOR_OPTS(NULL, NULL, NULL)
53 #define CFG_CUSTOM_MIN_WIDTH_OPT \
54 CFG_PTR_CB("min_width", NULL, CFGF_NONE, parse_min_width, free)
56 /* socket file descriptor for general purposes */
59 static bool exit_upon_signal = false;
61 cfg_t *cfg, *cfg_general, *cfg_section;
66 * Set the exit_upon_signal flag, because one cannot do anything in a safe
67 * manner in a signal handler (e.g. fprintf, which we really want to do for
68 * debugging purposes), see
69 * https://www.securecoding.cert.org/confluence/display/seccode/SIG30-C.+Call+only+asynchronous-safe+functions+within+signal+handlers
72 void fatalsig(int signum) {
73 exit_upon_signal = true;
77 * Do nothing upon SIGUSR1. Running this signal handler will nevertheless
78 * interrupt nanosleep() so that i3status immediately generates new output.
81 void sigusr1(int signum) {
85 * Checks if the given path exists by calling stat().
88 static bool path_exists(const char *path) {
90 return (stat(path, &buf) == 0);
93 static void *scalloc(size_t size) {
94 void *result = calloc(size, 1);
95 exit_if_null(result, "Error: out of memory (calloc(%zd))\n", size);
99 static char *sstrdup(const char *str) {
100 char *result = strdup(str);
101 exit_if_null(result, "Error: out of memory (strdup())\n");
106 * Parses the "align" module option (to validate input).
108 static int parse_align(cfg_t *context, cfg_opt_t *option, const char *value, void *result) {
109 if (strcasecmp(value, "left") != 0 && strcasecmp(value, "right") != 0 && strcasecmp(value, "center") != 0)
110 die("Invalid alignment attribute found in section %s, line %d: \"%s\"\n"
111 "Valid attributes are: left, center, right\n",
112 context->name, context->line, value);
114 const char **cresult = result;
121 * Parses the "min_width" module option whose value can either be a string or an integer.
123 static int parse_min_width(cfg_t *context, cfg_opt_t *option, const char *value, void *result) {
125 long num = strtol(value, &end, 10);
128 die("Invalid min_width attribute found in section %s, line %d: %d\n"
129 "Expected positive integer or string\n",
130 context->name, context->line, num);
131 else if (num == LONG_MIN || num == LONG_MAX || (end && *end != '\0'))
134 if (strlen(value) == 0)
135 die("Empty min_width attribute found in section %s, line %d\n"
136 "Expected positive integer or non-empty string\n",
137 context->name, context->line);
139 if (strcmp(value, "0") == 0)
140 die("Invalid min_width attribute found in section %s, line %d: \"%s\"\n"
141 "Expected positive integer or string\n",
142 context->name, context->line, value);
144 struct min_width *parsed = scalloc(sizeof(struct min_width));
147 /* num is preferred, but if it’s 0 (i.e. not valid), store and use
148 * the raw string value */
150 parsed->str = sstrdup(value);
152 struct min_width **cresult = result;
159 * Validates a color in "#RRGGBB" format
162 static int valid_color(const char *value) {
163 if (strlen(value) != 7)
167 for (int i = 1; i < 7; ++i) {
168 if (value[i] >= '0' && value[i] <= '9')
170 if (value[i] >= 'a' && value[i] <= 'f')
172 if (value[i] >= 'A' && value[i] <= 'F')
180 * This function resolves ~ in pathnames.
181 * It may resolve wildcards in the first part of the path, but if no match
182 * or multiple matches are found, it just returns a copy of path as given.
185 static char *resolve_tilde(const char *path) {
186 static glob_t globbuf;
187 char *head, *tail, *result = NULL;
189 tail = strchr(path, '/');
190 head = strndup(path, tail ? (size_t)(tail - path) : strlen(path));
192 int res = glob(head, GLOB_TILDE, NULL, &globbuf);
194 /* no match, or many wildcard matches are bad */
195 if (res == GLOB_NOMATCH || globbuf.gl_pathc != 1)
196 result = sstrdup(path);
198 die("glob() failed");
200 head = globbuf.gl_pathv[0];
201 result = scalloc(strlen(head) + (tail ? strlen(tail) : 0) + 1);
202 strncpy(result, head, strlen(head));
204 strncat(result, tail, strlen(tail));
211 static char *get_config_path(void) {
212 char *xdg_config_home, *xdg_config_dirs, *config_path;
214 /* 1: check the traditional path under the home directory */
215 config_path = resolve_tilde("~/.i3status.conf");
216 if (path_exists(config_path))
219 /* 2: check for $XDG_CONFIG_HOME/i3status/config */
220 if ((xdg_config_home = getenv("XDG_CONFIG_HOME")) == NULL)
221 xdg_config_home = "~/.config";
223 xdg_config_home = resolve_tilde(xdg_config_home);
224 if (asprintf(&config_path, "%s/i3status/config", xdg_config_home) == -1)
225 die("asprintf() failed");
226 free(xdg_config_home);
228 if (path_exists(config_path))
232 /* 3: check the traditional path under /etc */
233 config_path = SYSCONFDIR "/i3status.conf";
234 if (path_exists(config_path))
235 return sstrdup(config_path);
237 /* 4: check for $XDG_CONFIG_DIRS/i3status/config */
238 if ((xdg_config_dirs = getenv("XDG_CONFIG_DIRS")) == NULL)
239 xdg_config_dirs = "/etc/xdg";
241 char *buf = strdup(xdg_config_dirs);
242 char *tok = strtok(buf, ":");
243 while (tok != NULL) {
244 tok = resolve_tilde(tok);
245 if (asprintf(&config_path, "%s/i3status/config", tok) == -1)
246 die("asprintf() failed");
248 if (path_exists(config_path)) {
253 tok = strtok(NULL, ":");
257 die("Unable to find the configuration file (looked at "
258 "~/.i3status.conf, $XDG_CONFIG_HOME/i3status/config, "
259 "/etc/i3status.conf and $XDG_CONFIG_DIRS/i3status/config)");
264 * Returns the default separator to use if no custom separator has been specified.
266 static char *get_default_separator() {
267 if (output_format == O_DZEN2)
268 return "^p(5;-2)^ro(2)^p()^p(5)";
269 if (output_format == O_I3BAR)
270 // anything besides the empty string indicates that the default separator should be used
275 int main(int argc, char *argv[]) {
278 cfg_opt_t general_opts[] = {
279 CFG_STR("output_format", "auto", CFGF_NONE),
280 CFG_BOOL("colors", 1, CFGF_NONE),
281 CFG_STR("separator", "default", CFGF_NONE),
282 CFG_STR("color_separator", "#333333", CFGF_NONE),
283 CFG_INT("interval", 1, CFGF_NONE),
284 CFG_COLOR_OPTS("#00FF00", "#FFFF00", "#FF0000"),
287 cfg_opt_t run_watch_opts[] = {
288 CFG_STR("pidfile", NULL, CFGF_NONE),
289 CFG_STR("format", "%title: %status", CFGF_NONE),
290 CFG_CUSTOM_ALIGN_OPT,
291 CFG_CUSTOM_COLOR_OPTS,
292 CFG_CUSTOM_MIN_WIDTH_OPT,
295 cfg_opt_t path_exists_opts[] = {
296 CFG_STR("path", NULL, CFGF_NONE),
297 CFG_STR("format", "%title: %status", CFGF_NONE),
298 CFG_CUSTOM_ALIGN_OPT,
299 CFG_CUSTOM_COLOR_OPTS,
300 CFG_CUSTOM_MIN_WIDTH_OPT,
303 cfg_opt_t wireless_opts[] = {
304 CFG_STR("format_up", "W: (%quality at %essid, %bitrate) %ip", CFGF_NONE),
305 CFG_STR("format_down", "W: down", CFGF_NONE),
306 CFG_CUSTOM_ALIGN_OPT,
307 CFG_CUSTOM_COLOR_OPTS,
308 CFG_CUSTOM_MIN_WIDTH_OPT,
311 cfg_opt_t ethernet_opts[] = {
312 CFG_STR("format_up", "E: %ip (%speed)", CFGF_NONE),
313 CFG_STR("format_down", "E: down", CFGF_NONE),
314 CFG_CUSTOM_ALIGN_OPT,
315 CFG_CUSTOM_COLOR_OPTS,
316 CFG_CUSTOM_MIN_WIDTH_OPT,
319 cfg_opt_t ipv6_opts[] = {
320 CFG_STR("format_up", "%ip", CFGF_NONE),
321 CFG_STR("format_down", "no IPv6", CFGF_NONE),
322 CFG_CUSTOM_ALIGN_OPT,
323 CFG_CUSTOM_COLOR_OPTS,
324 CFG_CUSTOM_MIN_WIDTH_OPT,
327 cfg_opt_t battery_opts[] = {
328 CFG_STR("format", "%status %percentage %remaining", CFGF_NONE),
329 CFG_STR("format_down", "No battery", CFGF_NONE),
330 CFG_STR("status_chr", "CHR", CFGF_NONE),
331 CFG_STR("status_bat", "BAT", CFGF_NONE),
332 CFG_STR("status_full", "FULL", CFGF_NONE),
333 CFG_STR("path", "/sys/class/power_supply/BAT%d/uevent", CFGF_NONE),
334 CFG_INT("low_threshold", 30, CFGF_NONE),
335 CFG_STR("threshold_type", "time", CFGF_NONE),
336 CFG_BOOL("last_full_capacity", false, CFGF_NONE),
337 CFG_BOOL("integer_battery_capacity", false, CFGF_NONE),
338 CFG_BOOL("hide_seconds", false, CFGF_NONE),
339 CFG_CUSTOM_ALIGN_OPT,
340 CFG_CUSTOM_COLOR_OPTS,
341 CFG_CUSTOM_MIN_WIDTH_OPT,
344 cfg_opt_t time_opts[] = {
345 CFG_STR("format", "%Y-%m-%d %H:%M:%S", CFGF_NONE),
346 CFG_CUSTOM_ALIGN_OPT,
347 CFG_CUSTOM_MIN_WIDTH_OPT,
350 cfg_opt_t tztime_opts[] = {
351 CFG_STR("format", "%Y-%m-%d %H:%M:%S %Z", CFGF_NONE),
352 CFG_STR("timezone", "", CFGF_NONE),
353 CFG_CUSTOM_ALIGN_OPT,
354 CFG_CUSTOM_MIN_WIDTH_OPT,
357 cfg_opt_t ddate_opts[] = {
358 CFG_STR("format", "%{%a, %b %d%}, %Y%N - %H", CFGF_NONE),
359 CFG_CUSTOM_ALIGN_OPT,
360 CFG_CUSTOM_MIN_WIDTH_OPT,
363 cfg_opt_t load_opts[] = {
364 CFG_STR("format", "%1min %5min %15min", CFGF_NONE),
365 CFG_FLOAT("max_threshold", 5, CFGF_NONE),
366 CFG_CUSTOM_ALIGN_OPT,
367 CFG_CUSTOM_COLOR_OPTS,
368 CFG_CUSTOM_MIN_WIDTH_OPT,
371 cfg_opt_t usage_opts[] = {
372 CFG_STR("format", "%usage", CFGF_NONE),
373 CFG_CUSTOM_ALIGN_OPT,
374 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,
386 cfg_opt_t disk_opts[] = {
387 CFG_STR("format", "%free", CFGF_NONE),
388 CFG_STR("format_not_mounted", NULL, 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,
397 cfg_opt_t volume_opts[] = {
398 CFG_STR("format", "♪: %volume", CFGF_NONE),
399 CFG_STR("format_muted", "♪: 0%%", CFGF_NONE),
400 CFG_STR("device", "default", CFGF_NONE),
401 CFG_STR("mixer", "Master", CFGF_NONE),
402 CFG_INT("mixer_idx", 0, CFGF_NONE),
403 CFG_CUSTOM_ALIGN_OPT,
404 CFG_CUSTOM_COLOR_OPTS,
405 CFG_CUSTOM_MIN_WIDTH_OPT,
409 CFG_STR_LIST("order", "{}", CFGF_NONE),
410 CFG_SEC("general", general_opts, CFGF_NONE),
411 CFG_SEC("run_watch", run_watch_opts, CFGF_TITLE | CFGF_MULTI),
412 CFG_SEC("path_exists", path_exists_opts, CFGF_TITLE | CFGF_MULTI),
413 CFG_SEC("wireless", wireless_opts, CFGF_TITLE | CFGF_MULTI),
414 CFG_SEC("ethernet", ethernet_opts, CFGF_TITLE | CFGF_MULTI),
415 CFG_SEC("battery", battery_opts, CFGF_TITLE | CFGF_MULTI),
416 CFG_SEC("cpu_temperature", temp_opts, CFGF_TITLE | CFGF_MULTI),
417 CFG_SEC("disk", disk_opts, CFGF_TITLE | CFGF_MULTI),
418 CFG_SEC("volume", volume_opts, CFGF_TITLE | CFGF_MULTI),
419 CFG_SEC("ipv6", ipv6_opts, CFGF_NONE),
420 CFG_SEC("time", time_opts, CFGF_NONE),
421 CFG_SEC("tztime", tztime_opts, CFGF_TITLE | CFGF_MULTI),
422 CFG_SEC("ddate", ddate_opts, CFGF_NONE),
423 CFG_SEC("load", load_opts, CFGF_NONE),
424 CFG_SEC("cpu_usage", usage_opts, CFGF_NONE),
427 char *configfile = NULL;
428 int o, option_index = 0;
429 struct option long_options[] = {
430 {"config", required_argument, 0, 'c'},
431 {"help", no_argument, 0, 'h'},
432 {"version", no_argument, 0, 'v'},
435 struct sigaction action;
436 memset(&action, 0, sizeof(struct sigaction));
437 action.sa_handler = fatalsig;
439 /* Exit upon SIGPIPE because when we have nowhere to write to, gathering system
440 * information is pointless. Also exit explicitly on SIGTERM and SIGINT because
441 * only this will trigger a reset of the cursor in the terminal output-format.
443 sigaction(SIGPIPE, &action, NULL);
444 sigaction(SIGTERM, &action, NULL);
445 sigaction(SIGINT, &action, NULL);
447 memset(&action, 0, sizeof(struct sigaction));
448 action.sa_handler = sigusr1;
449 sigaction(SIGUSR1, &action, NULL);
451 if (setlocale(LC_ALL, "") == NULL)
452 die("Could not set locale. Please make sure all your LC_* / LANG settings are correct.");
454 while ((o = getopt_long(argc, argv, "c:hv", long_options, &option_index)) != -1)
457 else if ((char)o == 'h') {
458 printf("i3status " VERSION " © 2008-2012 Michael Stapelberg and contributors\n"
459 "Syntax: %s [-c <configfile>] [-h] [-v]\n",
462 } else if ((char)o == 'v') {
463 printf("i3status " VERSION " © 2008-2012 Michael Stapelberg and contributors\n");
467 if (configfile == NULL)
468 configfile = get_config_path();
470 cfg = cfg_init(opts, CFGF_NOCASE);
471 if (cfg_parse(cfg, configfile) == CFG_PARSE_ERROR)
474 if (cfg_size(cfg, "order") == 0)
475 die("Your 'order' array is empty. Please fix your config.\n");
477 cfg_general = cfg_getsec(cfg, "general");
478 if (cfg_general == NULL)
479 die("Could not get section \"general\"\n");
481 char *output_str = cfg_getstr(cfg_general, "output_format");
482 if (strcasecmp(output_str, "auto") == 0) {
483 fprintf(stderr, "i3status: trying to auto-detect output_format setting\n");
484 output_str = auto_detect_format();
487 fprintf(stderr, "i3status: falling back to \"none\"\n");
489 fprintf(stderr, "i3status: auto-detected \"%s\"\n", output_str);
493 if (strcasecmp(output_str, "dzen2") == 0)
494 output_format = O_DZEN2;
495 else if (strcasecmp(output_str, "xmobar") == 0)
496 output_format = O_XMOBAR;
497 else if (strcasecmp(output_str, "i3bar") == 0)
498 output_format = O_I3BAR;
499 else if (strcasecmp(output_str, "term") == 0)
500 output_format = O_TERM;
501 else if (strcasecmp(output_str, "none") == 0)
502 output_format = O_NONE;
504 die("Unknown output format: \"%s\"\n", output_str);
506 const char *separator = cfg_getstr(cfg_general, "separator");
508 // if no custom separator has been provided, use the default one
509 if (strcasecmp(separator, "default") == 0)
510 separator = get_default_separator();
512 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")))
513 die("Bad color format");
516 yajl_gen json_gen = yajl_gen_alloc(NULL);
518 yajl_gen json_gen = yajl_gen_alloc(NULL, NULL);
521 if (output_format == O_I3BAR) {
522 /* Initialize the i3bar protocol. See i3/docs/i3bar-protocol
524 printf("{\"version\":1}\n[\n");
526 yajl_gen_array_open(json_gen);
527 yajl_gen_clear(json_gen);
529 if (output_format == O_TERM) {
530 /* Save the cursor-position and hide the cursor */
531 printf("\033[s\033[?25l");
533 atexit(&reset_cursor);
536 if ((general_socket = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
537 die("Could not create socket\n");
539 int interval = cfg_getint(cfg_general, "interval");
541 /* One memory page which each plugin can use to buffer output.
542 * Even though it’s unclean, we just assume that the user will not
543 * specify a format string which expands to something longer than 4096
544 * bytes — given that the output of i3status is used to display
545 * information on screen, more than 1024 characters for the full line
546 * (!), not individual plugins, seem very unlikely. */
549 void **per_instance = calloc(cfg_size(cfg, "order"), sizeof(*per_instance));
552 if (exit_upon_signal) {
553 fprintf(stderr, "Exiting due to signal.\n");
557 gettimeofday(&tv, NULL);
558 if (output_format == O_I3BAR)
559 yajl_gen_array_open(json_gen);
560 else if (output_format == O_TERM)
561 /* Restore the cursor-position, clear line */
562 printf("\033[u\033[K");
563 for (j = 0; j < cfg_size(cfg, "order"); j++) {
564 cur_instance = per_instance + j;
566 print_separator(separator);
568 const char *current = cfg_getnstr(cfg, "order", j);
571 SEC_OPEN_MAP("ipv6");
572 print_ipv6_info(json_gen, buffer, cfg_getstr(sec, "format_up"), cfg_getstr(sec, "format_down"));
576 CASE_SEC_TITLE("wireless") {
577 SEC_OPEN_MAP("wireless");
578 const char *interface = NULL;
579 if (strcasecmp(title, "_first_") == 0)
580 interface = first_eth_interface(NET_TYPE_WIRELESS);
581 if (interface == NULL)
583 print_wireless_info(json_gen, buffer, interface, cfg_getstr(sec, "format_up"), cfg_getstr(sec, "format_down"));
587 CASE_SEC_TITLE("ethernet") {
588 SEC_OPEN_MAP("ethernet");
589 const char *interface = NULL;
590 if (strcasecmp(title, "_first_") == 0)
591 interface = first_eth_interface(NET_TYPE_ETHERNET);
592 if (interface == NULL)
594 print_eth_info(json_gen, buffer, interface, cfg_getstr(sec, "format_up"), cfg_getstr(sec, "format_down"));
598 CASE_SEC_TITLE("battery") {
599 SEC_OPEN_MAP("battery");
600 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"));
604 CASE_SEC_TITLE("run_watch") {
605 SEC_OPEN_MAP("run_watch");
606 print_run_watch(json_gen, buffer, title, cfg_getstr(sec, "pidfile"), cfg_getstr(sec, "format"));
610 CASE_SEC_TITLE("path_exists") {
611 SEC_OPEN_MAP("path_exists");
612 print_path_exists(json_gen, buffer, title, cfg_getstr(sec, "path"), cfg_getstr(sec, "format"));
616 CASE_SEC_TITLE("disk") {
617 SEC_OPEN_MAP("disk_info");
618 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"));
623 SEC_OPEN_MAP("load");
624 print_load(json_gen, buffer, cfg_getstr(sec, "format"), cfg_getfloat(sec, "max_threshold"));
629 SEC_OPEN_MAP("time");
630 print_time(json_gen, buffer, NULL, cfg_getstr(sec, "format"), NULL, tv.tv_sec);
634 CASE_SEC_TITLE("tztime") {
635 SEC_OPEN_MAP("tztime");
636 print_time(json_gen, buffer, title, cfg_getstr(sec, "format"), cfg_getstr(sec, "timezone"), tv.tv_sec);
641 SEC_OPEN_MAP("ddate");
642 print_ddate(json_gen, buffer, cfg_getstr(sec, "format"), tv.tv_sec);
646 CASE_SEC_TITLE("volume") {
647 SEC_OPEN_MAP("volume");
648 print_volume(json_gen, buffer, cfg_getstr(sec, "format"),
649 cfg_getstr(sec, "format_muted"),
650 cfg_getstr(sec, "device"),
651 cfg_getstr(sec, "mixer"),
652 cfg_getint(sec, "mixer_idx"));
656 CASE_SEC_TITLE("cpu_temperature") {
657 SEC_OPEN_MAP("cpu_temperature");
658 print_cpu_temperature_info(json_gen, buffer, atoi(title), cfg_getstr(sec, "path"), cfg_getstr(sec, "format"), cfg_getint(sec, "max_threshold"));
662 CASE_SEC("cpu_usage") {
663 SEC_OPEN_MAP("cpu_usage");
664 print_cpu_usage(json_gen, buffer, cfg_getstr(sec, "format"));
668 if (output_format == O_I3BAR) {
669 yajl_gen_array_close(json_gen);
670 const unsigned char *buf;
676 yajl_gen_get_buf(json_gen, &buf, &len);
677 write(STDOUT_FILENO, buf, len);
678 yajl_gen_clear(json_gen);
684 /* To provide updates on every full second (as good as possible)
685 * we don’t use sleep(interval) but we sleep until the next
686 * second (with microsecond precision) plus (interval-1)
687 * seconds. We also align to 60 seconds modulo interval such
688 * that we start with :00 on every new minute. */
689 struct timeval current_timeval;
690 gettimeofday(¤t_timeval, NULL);
691 struct timespec ts = {interval - 1 - (current_timeval.tv_sec % interval), (10e5 - current_timeval.tv_usec) * 1000};
692 nanosleep(&ts, NULL);