d20a8142e87b9a6ed9988c686ccc979b4343e549
1 /**
2 * collectd - src/rrdtool.c
3 * Copyright (C) 2006,2007 Florian octo Forster
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; only version 2 of the License is applicable.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 *
18 * Authors:
19 * Florian octo Forster <octo at verplant.org>
20 **/
22 #include "collectd.h"
23 #include "plugin.h"
24 #include "common.h"
25 #include "utils_avltree.h"
27 #if HAVE_PTHREAD_H
28 # include <pthread.h>
29 #endif
31 /*
32 * Private types
33 */
34 struct rrd_cache_s
35 {
36 int values_num;
37 char **values;
38 time_t first_value;
39 time_t last_value;
40 };
41 typedef struct rrd_cache_s rrd_cache_t;
43 /*
44 * Private variables
45 */
46 static int rra_timespans[] =
47 {
48 3600,
49 86400,
50 604800,
51 2678400,
52 31622400
53 };
54 static int rra_timespans_num = STATIC_ARRAY_SIZE (rra_timespans);
56 static int *rra_timespans_custom = NULL;
57 static int rra_timespans_custom_num = 0;
59 static char *rra_types[] =
60 {
61 "AVERAGE",
62 "MIN",
63 "MAX"
64 };
65 static int rra_types_num = STATIC_ARRAY_SIZE (rra_types);
67 static const char *config_keys[] =
68 {
69 "CacheTimeout",
70 "CacheFlush",
71 "DataDir",
72 "StepSize",
73 "HeartBeat",
74 "RRARows",
75 "RRATimespan",
76 "XFF"
77 };
78 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
80 static char *datadir = NULL;
81 static int stepsize = 0;
82 static int heartbeat = 0;
83 static int rrarows = 1200;
84 static double xff = 0.1;
86 static int cache_timeout = 0;
87 static int cache_flush_timeout = 0;
88 static time_t cache_flush_last;
89 static avl_tree_t *cache = NULL;
90 static pthread_mutex_t cache_lock = PTHREAD_MUTEX_INITIALIZER;
92 /* * * * * * * * * *
93 * WARNING: Magic *
94 * * * * * * * * * */
95 static int rra_get (char ***ret)
96 {
97 static char **rra_def = NULL;
98 static int rra_num = 0;
100 int *rts;
101 int rts_num;
103 int rra_max;
105 int span;
107 int cdp_num;
108 int cdp_len;
109 int i, j;
111 char buffer[64];
113 if ((rra_num != 0) && (rra_def != NULL))
114 {
115 *ret = rra_def;
116 return (rra_num);
117 }
119 /* Use the configured timespans or fall back to the built-in defaults */
120 if (rra_timespans_custom_num != 0)
121 {
122 rts = rra_timespans_custom;
123 rts_num = rra_timespans_custom_num;
124 }
125 else
126 {
127 rts = rra_timespans;
128 rts_num = rra_timespans_num;
129 }
131 rra_max = rts_num * rra_types_num;
133 if ((rra_def = (char **) malloc ((rra_max + 1) * sizeof (char *))) == NULL)
134 return (-1);
135 memset (rra_def, '\0', (rra_max + 1) * sizeof (char *));
137 if ((stepsize <= 0) || (rrarows <= 0))
138 {
139 *ret = NULL;
140 return (-1);
141 }
143 cdp_len = 0;
144 for (i = 0; i < rts_num; i++)
145 {
146 span = rts[i];
148 if ((span / stepsize) < rrarows)
149 continue;
151 if (cdp_len == 0)
152 cdp_len = 1;
153 else
154 cdp_len = (int) floor (((double) span)
155 / ((double) (rrarows * stepsize)));
157 cdp_num = (int) ceil (((double) span)
158 / ((double) (cdp_len * stepsize)));
160 for (j = 0; j < rra_types_num; j++)
161 {
162 if (rra_num >= rra_max)
163 break;
165 if (snprintf (buffer, sizeof (buffer), "RRA:%s:%3.1f:%u:%u",
166 rra_types[j], xff,
167 cdp_len, cdp_num) >= sizeof (buffer))
168 {
169 ERROR ("rra_get: Buffer would have been truncated.");
170 continue;
171 }
173 rra_def[rra_num++] = sstrdup (buffer);
174 }
175 }
177 #if COLLECT_DEBUG
178 DEBUG ("rra_num = %i", rra_num);
179 for (i = 0; i < rra_num; i++)
180 DEBUG (" %s", rra_def[i]);
181 #endif
183 *ret = rra_def;
184 return (rra_num);
185 }
187 static void ds_free (int ds_num, char **ds_def)
188 {
189 int i;
191 for (i = 0; i < ds_num; i++)
192 if (ds_def[i] != NULL)
193 free (ds_def[i]);
194 free (ds_def);
195 }
197 static int ds_get (char ***ret, const data_set_t *ds)
198 {
199 char **ds_def;
200 int ds_num;
202 char min[32];
203 char max[32];
204 char buffer[128];
206 DEBUG ("ds->ds_num = %i", ds->ds_num);
208 ds_def = (char **) malloc (ds->ds_num * sizeof (char *));
209 if (ds_def == NULL)
210 {
211 char errbuf[1024];
212 ERROR ("rrdtool plugin: malloc failed: %s",
213 sstrerror (errno, errbuf, sizeof (errbuf)));
214 return (-1);
215 }
216 memset (ds_def, '\0', ds->ds_num * sizeof (char *));
218 for (ds_num = 0; ds_num < ds->ds_num; ds_num++)
219 {
220 data_source_t *d = ds->ds + ds_num;
221 char *type;
222 int status;
224 ds_def[ds_num] = NULL;
226 if (d->type == DS_TYPE_COUNTER)
227 type = "COUNTER";
228 else if (d->type == DS_TYPE_GAUGE)
229 type = "GAUGE";
230 else
231 {
232 ERROR ("rrdtool plugin: Unknown DS type: %i",
233 d->type);
234 break;
235 }
237 if (isnan (d->min))
238 {
239 strcpy (min, "U");
240 }
241 else
242 {
243 snprintf (min, sizeof (min), "%lf", d->min);
244 min[sizeof (min) - 1] = '\0';
245 }
247 if (isnan (d->max))
248 {
249 strcpy (max, "U");
250 }
251 else
252 {
253 snprintf (max, sizeof (max), "%lf", d->max);
254 max[sizeof (max) - 1] = '\0';
255 }
257 status = snprintf (buffer, sizeof (buffer),
258 "DS:%s:%s:%i:%s:%s",
259 d->name, type, heartbeat,
260 min, max);
261 if ((status < 1) || (status >= sizeof (buffer)))
262 break;
264 ds_def[ds_num] = sstrdup (buffer);
265 } /* for ds_num = 0 .. ds->ds_num */
267 #if COLLECT_DEBUG
268 {
269 int i;
270 DEBUG ("ds_num = %i", ds_num);
271 for (i = 0; i < ds_num; i++)
272 DEBUG (" %s", ds_def[i]);
273 }
274 #endif
276 if (ds_num != ds->ds_num)
277 {
278 ds_free (ds_num, ds_def);
279 return (-1);
280 }
282 *ret = ds_def;
283 return (ds_num);
284 }
286 static int rrd_create_file (char *filename, const data_set_t *ds)
287 {
288 char **argv;
289 int argc;
290 char **rra_def;
291 int rra_num;
292 char **ds_def;
293 int ds_num;
294 int i, j;
295 char stepsize_str[16];
296 int status = 0;
298 if (check_create_dir (filename))
299 return (-1);
301 if ((rra_num = rra_get (&rra_def)) < 1)
302 {
303 ERROR ("rrd_create_file failed: Could not calculate RRAs");
304 return (-1);
305 }
307 if ((ds_num = ds_get (&ds_def, ds)) < 1)
308 {
309 ERROR ("rrd_create_file failed: Could not calculate DSes");
310 return (-1);
311 }
313 argc = ds_num + rra_num + 4;
315 if ((argv = (char **) malloc (sizeof (char *) * (argc + 1))) == NULL)
316 {
317 char errbuf[1024];
318 ERROR ("rrd_create failed: %s",
319 sstrerror (errno, errbuf, sizeof (errbuf)));
320 return (-1);
321 }
323 status = snprintf (stepsize_str, sizeof (stepsize_str),
324 "%i", stepsize);
325 if ((status < 1) || (status >= sizeof (stepsize_str)))
326 {
327 ERROR ("rrdtool plugin: snprintf failed.");
328 return (-1);
329 }
331 argv[0] = "create";
332 argv[1] = filename;
333 argv[2] = "-s";
334 argv[3] = stepsize_str;
336 j = 4;
337 for (i = 0; i < ds_num; i++)
338 argv[j++] = ds_def[i];
339 for (i = 0; i < rra_num; i++)
340 argv[j++] = rra_def[i];
341 argv[j] = NULL;
343 optind = 0; /* bug in librrd? */
344 rrd_clear_error ();
345 if (rrd_create (argc, argv) == -1)
346 {
347 ERROR ("rrd_create failed: %s: %s", filename, rrd_get_error ());
348 status = -1;
349 }
351 free (argv);
352 ds_free (ds_num, ds_def);
354 return (status);
355 }
357 static int value_list_to_string (char *buffer, int buffer_len,
358 const data_set_t *ds, const value_list_t *vl)
359 {
360 int offset;
361 int status;
362 int i;
364 memset (buffer, '\0', buffer_len);
366 status = snprintf (buffer, buffer_len, "%u", (unsigned int) vl->time);
367 if ((status < 1) || (status >= buffer_len))
368 return (-1);
369 offset = status;
371 for (i = 0; i < ds->ds_num; i++)
372 {
373 if ((ds->ds[i].type != DS_TYPE_COUNTER)
374 && (ds->ds[i].type != DS_TYPE_GAUGE))
375 return (-1);
377 if (ds->ds[i].type == DS_TYPE_COUNTER)
378 status = snprintf (buffer + offset, buffer_len - offset,
379 ":%llu", vl->values[i].counter);
380 else
381 status = snprintf (buffer + offset, buffer_len - offset,
382 ":%lf", vl->values[i].gauge);
384 if ((status < 1) || (status >= (buffer_len - offset)))
385 return (-1);
387 offset += status;
388 } /* for ds->ds_num */
390 return (0);
391 } /* int value_list_to_string */
393 static int value_list_to_filename (char *buffer, int buffer_len,
394 const data_set_t *ds, const value_list_t *vl)
395 {
396 int offset = 0;
397 int status;
399 if (datadir != NULL)
400 {
401 status = snprintf (buffer + offset, buffer_len - offset,
402 "%s/", datadir);
403 if ((status < 1) || (status >= buffer_len - offset))
404 return (-1);
405 offset += status;
406 }
408 status = snprintf (buffer + offset, buffer_len - offset,
409 "%s/", vl->host);
410 if ((status < 1) || (status >= buffer_len - offset))
411 return (-1);
412 offset += status;
414 if (strlen (vl->plugin_instance) > 0)
415 status = snprintf (buffer + offset, buffer_len - offset,
416 "%s-%s/", vl->plugin, vl->plugin_instance);
417 else
418 status = snprintf (buffer + offset, buffer_len - offset,
419 "%s/", vl->plugin);
420 if ((status < 1) || (status >= buffer_len - offset))
421 return (-1);
422 offset += status;
424 if (strlen (vl->type_instance) > 0)
425 status = snprintf (buffer + offset, buffer_len - offset,
426 "%s-%s.rrd", ds->type, vl->type_instance);
427 else
428 status = snprintf (buffer + offset, buffer_len - offset,
429 "%s.rrd", ds->type);
430 if ((status < 1) || (status >= buffer_len - offset))
431 return (-1);
432 offset += status;
434 return (0);
435 } /* int value_list_to_filename */
437 static rrd_cache_t *rrd_cache_insert (const char *filename,
438 const char *value, time_t value_time)
439 {
440 rrd_cache_t *rc = NULL;
441 int new_rc = 0;
443 if (cache != NULL)
444 avl_get (cache, filename, (void *) &rc);
446 if (rc == NULL)
447 {
448 rc = (rrd_cache_t *) malloc (sizeof (rrd_cache_t));
449 if (rc == NULL)
450 return (NULL);
451 rc->values_num = 0;
452 rc->values = NULL;
453 rc->first_value = 0;
454 rc->last_value = 0;
455 new_rc = 1;
456 }
458 if (rc->last_value >= value_time)
459 {
460 WARNING ("rrdtool plugin: (rc->last_value = %u) >= (value_time = %u)",
461 (unsigned int) rc->last_value,
462 (unsigned int) value_time);
463 return (NULL);
464 }
466 rc->values = (char **) realloc ((void *) rc->values,
467 (rc->values_num + 1) * sizeof (char *));
468 if (rc->values == NULL)
469 {
470 char errbuf[1024];
471 ERROR ("rrdtool plugin: realloc failed: %s",
472 sstrerror (errno, errbuf, sizeof (errbuf)));
473 if (cache != NULL)
474 {
475 void *cache_key = NULL;
476 avl_remove (cache, filename, &cache_key, NULL);
477 sfree (cache_key);
478 }
479 free (rc);
480 return (NULL);
481 }
483 rc->values[rc->values_num] = strdup (value);
484 if (rc->values[rc->values_num] != NULL)
485 rc->values_num++;
487 if (rc->values_num == 1)
488 rc->first_value = value_time;
489 rc->last_value = value_time;
491 /* Insert if this is the first value */
492 if ((cache != NULL) && (new_rc == 1))
493 {
494 void *cache_key = strdup (filename);
496 if (cache_key == NULL)
497 {
498 char errbuf[1024];
499 ERROR ("rrdtool plugin: strdup failed: %s",
500 sstrerror (errno, errbuf, sizeof (errbuf)));
501 sfree (rc->values[0]);
502 sfree (rc->values);
503 sfree (rc);
504 return (NULL);
505 }
507 avl_insert (cache, cache_key, rc);
508 }
510 DEBUG ("rrd_cache_insert (%s, %s, %u) = %p", filename, value,
511 (unsigned int) value_time, (void *) rc);
513 return (rc);
514 } /* rrd_cache_t *rrd_cache_insert */
516 static int rrd_write_cache_entry (const char *filename, rrd_cache_t *rc)
517 {
518 char **argv;
519 int argc;
521 char *fn;
522 int status;
524 int i;
526 if (rc->values_num < 1)
527 return (0);
529 argc = rc->values_num + 2;
530 argv = (char **) malloc ((argc + 1) * sizeof (char *));
531 if (argv == NULL)
532 return (-1);
534 fn = strdup (filename);
535 if (fn == NULL)
536 {
537 free (argv);
538 return (-1);
539 }
541 argv[0] = "update";
542 argv[1] = fn;
543 memcpy (argv + 2, rc->values, rc->values_num * sizeof (char *));
544 argv[argc] = NULL;
546 DEBUG ("rrd_update (argc = %i, argv = %p)", argc, (void *) argv);
548 optind = 0; /* bug in librrd? */
549 rrd_clear_error ();
550 status = rrd_update (argc, argv);
551 if (status != 0)
552 {
553 WARNING ("rrd_update failed: %s: %s",
554 filename, rrd_get_error ());
555 status = -1;
556 }
558 free (argv);
559 free (fn);
560 /* Free the value list of `rc' */
561 for (i = 0; i < rc->values_num; i++)
562 free (rc->values[i]);
563 free (rc->values);
564 rc->values = NULL;
565 rc->values_num = 0;
567 return (status);
568 } /* int rrd_write_cache_entry */
570 static void rrd_cache_flush (int timeout)
571 {
572 rrd_cache_t *rc;
573 time_t now;
575 char **keys = NULL;
576 int keys_num = 0;
578 char *key;
579 avl_iterator_t *iter;
580 int i;
582 if (cache == NULL)
583 return;
585 DEBUG ("Flushing cache, timeout = %i", timeout);
587 now = time (NULL);
589 /* Build a list of entries to be flushed */
590 iter = avl_get_iterator (cache);
591 while (avl_iterator_next (iter, (void *) &key, (void *) &rc) == 0)
592 {
593 DEBUG ("key = %s; age = %i;", key, now - rc->first_value);
594 if ((now - rc->first_value) >= timeout)
595 {
596 keys = (char **) realloc ((void *) keys,
597 (keys_num + 1) * sizeof (char *));
598 if (keys == NULL)
599 {
600 char errbuf[1024];
601 ERROR ("rrdtool plugin: "
602 "realloc failed: %s",
603 sstrerror (errno, errbuf,
604 sizeof (errbuf)));
605 avl_iterator_destroy (iter);
606 return;
607 }
608 keys[keys_num] = key;
609 keys_num++;
610 }
611 } /* while (avl_iterator_next) */
612 avl_iterator_destroy (iter);
614 for (i = 0; i < keys_num; i++)
615 {
616 if (avl_remove (cache, keys[i], (void *) &key, (void *) &rc) != 0)
617 {
618 DEBUG ("avl_remove (%s) failed.", keys[i]);
619 continue;
620 }
622 rrd_write_cache_entry (keys[i], rc);
623 /* rc's value-list is free's by `rrd_write_cache_entry' */
624 sfree (rc);
625 sfree (key);
626 keys[i] = NULL;
627 } /* for (i = 0..keys_num) */
629 free (keys);
630 DEBUG ("Flushed %i value(s)", keys_num);
632 cache_flush_last = now;
633 } /* void rrd_cache_flush */
635 static int rrd_write (const data_set_t *ds, const value_list_t *vl)
636 {
637 struct stat statbuf;
638 char filename[512];
639 char values[512];
640 rrd_cache_t *rc;
641 time_t now;
643 if (value_list_to_filename (filename, sizeof (filename), ds, vl) != 0)
644 return (-1);
646 if (value_list_to_string (values, sizeof (values), ds, vl) != 0)
647 return (-1);
649 if (stat (filename, &statbuf) == -1)
650 {
651 if (errno == ENOENT)
652 {
653 if (rrd_create_file (filename, ds))
654 return (-1);
655 }
656 else
657 {
658 char errbuf[1024];
659 ERROR ("stat(%s) failed: %s", filename,
660 sstrerror (errno, errbuf,
661 sizeof (errbuf)));
662 return (-1);
663 }
664 }
665 else if (!S_ISREG (statbuf.st_mode))
666 {
667 ERROR ("stat(%s): Not a regular file!",
668 filename);
669 return (-1);
670 }
672 pthread_mutex_lock (&cache_lock);
673 rc = rrd_cache_insert (filename, values, vl->time);
674 if (rc == NULL)
675 {
676 pthread_mutex_unlock (&cache_lock);
677 return (-1);
678 }
680 if (cache == NULL)
681 {
682 rrd_write_cache_entry (filename, rc);
683 /* rc's value-list is free's by `rrd_write_cache_entry' */
684 sfree (rc);
685 pthread_mutex_unlock (&cache_lock);
686 return (0);
687 }
689 now = time (NULL);
691 DEBUG ("age (%s) = %i", filename, now - rc->first_value);
693 /* `rc' is not free'd here, because we'll likely reuse it. If not, then
694 * the next flush will remove this entry. */
695 if ((now - rc->first_value) >= cache_timeout)
696 rrd_write_cache_entry (filename, rc);
698 if ((now - cache_flush_last) >= cache_flush_timeout)
699 rrd_cache_flush (cache_flush_timeout);
701 pthread_mutex_unlock (&cache_lock);
702 return (0);
703 } /* int rrd_write */
705 static int rrd_config (const char *key, const char *value)
706 {
707 if (strcasecmp ("CacheTimeout", key) == 0)
708 {
709 int tmp = atoi (value);
710 if (tmp < 0)
711 {
712 fprintf (stderr, "rrdtool: `CacheTimeout' must "
713 "be greater than 0.\n");
714 return (1);
715 }
716 cache_timeout = tmp;
717 }
718 else if (strcasecmp ("CacheFlush", key) == 0)
719 {
720 int tmp = atoi (value);
721 if (tmp < 0)
722 {
723 fprintf (stderr, "rrdtool: `CacheFlush' must "
724 "be greater than 0.\n");
725 return (1);
726 }
727 cache_flush_timeout = tmp;
728 }
729 else if (strcasecmp ("DataDir", key) == 0)
730 {
731 if (datadir != NULL)
732 free (datadir);
733 datadir = strdup (value);
734 if (datadir != NULL)
735 {
736 int len = strlen (datadir);
737 while ((len > 0) && (datadir[len - 1] == '/'))
738 {
739 len--;
740 datadir[len] = '\0';
741 }
742 if (len <= 0)
743 {
744 free (datadir);
745 datadir = NULL;
746 }
747 }
748 }
749 else if (strcasecmp ("StepSize", key) == 0)
750 {
751 int tmp = atoi (value);
752 if (tmp <= 0)
753 {
754 fprintf (stderr, "rrdtool: `StepSize' must "
755 "be greater than 0.\n");
756 return (1);
757 }
758 stepsize = tmp;
759 }
760 else if (strcasecmp ("HeartBeat", key) == 0)
761 {
762 int tmp = atoi (value);
763 if (tmp <= 0)
764 {
765 fprintf (stderr, "rrdtool: `HeartBeat' must "
766 "be greater than 0.\n");
767 return (1);
768 }
769 heartbeat = tmp;
770 }
771 else if (strcasecmp ("RRARows", key) == 0)
772 {
773 int tmp = atoi (value);
774 if (tmp <= 0)
775 {
776 fprintf (stderr, "rrdtool: `RRARows' must "
777 "be greater than 0.\n");
778 return (1);
779 }
780 rrarows = tmp;
781 }
782 else if (strcasecmp ("RRATimespan", key) == 0)
783 {
784 char *saveptr = NULL;
785 char *dummy;
786 char *ptr;
787 char *value_copy;
788 int *tmp_alloc;
790 value_copy = strdup (value);
791 if (value_copy == NULL)
792 return (1);
794 dummy = value_copy;
795 while ((ptr = strtok_r (dummy, ", \t", &saveptr)) != NULL)
796 {
797 dummy = NULL;
799 tmp_alloc = realloc (rra_timespans_custom,
800 sizeof (int) * (rra_timespans_custom_num + 1));
801 if (tmp_alloc == NULL)
802 {
803 fprintf (stderr, "rrdtool: realloc failed.\n");
804 free (value_copy);
805 return (1);
806 }
807 rra_timespans_custom = tmp_alloc;
808 rra_timespans_custom[rra_timespans_custom_num] = atoi (ptr);
809 if (rra_timespans_custom[rra_timespans_custom_num] != 0)
810 rra_timespans_custom_num++;
811 } /* while (strtok_r) */
812 free (value_copy);
813 }
814 else if (strcasecmp ("XFF", key) == 0)
815 {
816 double tmp = atof (value);
817 if ((tmp < 0.0) || (tmp >= 1.0))
818 {
819 fprintf (stderr, "rrdtool: `XFF' must "
820 "be in the range 0 to 1 (exclusive).");
821 return (1);
822 }
823 xff = tmp;
824 }
825 else
826 {
827 return (-1);
828 }
829 return (0);
830 } /* int rrd_config */
832 static int rrd_shutdown (void)
833 {
834 pthread_mutex_lock (&cache_lock);
835 rrd_cache_flush (-1);
836 if (cache != NULL)
837 avl_destroy (cache);
838 cache = NULL;
839 pthread_mutex_unlock (&cache_lock);
841 return (0);
842 } /* int rrd_shutdown */
844 static int rrd_init (void)
845 {
846 if (stepsize <= 0)
847 stepsize = interval_g;
848 if (heartbeat <= 0)
849 heartbeat = 2 * interval_g;
851 if (heartbeat < interval_g)
852 WARNING ("rrdtool plugin: Your `heartbeat' is "
853 "smaller than your `interval'. This will "
854 "likely cause problems.");
855 else if (stepsize < interval_g)
856 WARNING ("rrdtool plugin: Your `stepsize' is "
857 "smaller than your `interval'. This will "
858 "create needlessly big RRD-files.");
860 pthread_mutex_lock (&cache_lock);
861 if (cache_timeout < 2)
862 {
863 cache_timeout = 0;
864 cache_flush_timeout = 0;
865 }
866 else
867 {
868 if (cache_flush_timeout < cache_timeout)
869 cache_flush_timeout = 10 * cache_timeout;
871 cache = avl_create ((int (*) (const void *, const void *)) strcmp);
872 cache_flush_last = time (NULL);
873 plugin_register_shutdown ("rrdtool", rrd_shutdown);
874 }
875 pthread_mutex_unlock (&cache_lock);
877 DEBUG ("rrdtool plugin: rrd_init: datadir = %s; stepsize = %i;"
878 " heartbeat = %i; rrarows = %i; xff = %lf;",
879 (datadir == NULL) ? "(null)" : datadir,
880 stepsize, heartbeat, rrarows, xff);
882 return (0);
883 } /* int rrd_init */
885 void module_register (void)
886 {
887 plugin_register_config ("rrdtool", rrd_config,
888 config_keys, config_keys_num);
889 plugin_register_init ("rrdtool", rrd_init);
890 plugin_register_write ("rrdtool", rrd_write);
891 }