814b3e390f137fea1009260667329433686516ef
1 /**
2 * collectd - src/rrdtool.c
3 * Copyright (C) 2006 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 };
40 typedef struct rrd_cache_s rrd_cache_t;
42 /*
43 * Private variables
44 */
45 static int rra_timespans[] =
46 {
47 3600,
48 86400,
49 604800,
50 2678400,
51 31622400
52 };
53 static int rra_timespans_num = STATIC_ARRAY_SIZE (rra_timespans);
55 static int *rra_timespans_custom = NULL;
56 static int rra_timespans_custom_num = 0;
58 static char *rra_types[] =
59 {
60 "AVERAGE",
61 "MIN",
62 "MAX"
63 };
64 static int rra_types_num = STATIC_ARRAY_SIZE (rra_types);
66 static const char *config_keys[] =
67 {
68 "CacheTimeout",
69 "CacheFlush",
70 "DataDir",
71 "StepSize",
72 "HeartBeat",
73 "RRARows",
74 "RRATimespan",
75 "XFF"
76 };
77 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
79 static char *datadir = NULL;
80 static int stepsize = 0;
81 static int heartbeat = 0;
82 static int rrarows = 1200;
83 static double xff = 0.1;
85 static int cache_timeout = 0;
86 static int cache_flush_timeout = 0;
87 static time_t cache_flush_last;
88 static avl_tree_t *cache = NULL;
89 static pthread_mutex_t cache_lock = PTHREAD_MUTEX_INITIALIZER;
91 /* * * * * * * * * *
92 * WARNING: Magic *
93 * * * * * * * * * */
94 static int rra_get (char ***ret)
95 {
96 static char **rra_def = NULL;
97 static int rra_num = 0;
99 int *rts;
100 int rts_num;
102 int rra_max;
104 int span;
106 int cdp_num;
107 int cdp_len;
108 int i, j;
110 char buffer[64];
112 if ((rra_num != 0) && (rra_def != NULL))
113 {
114 *ret = rra_def;
115 return (rra_num);
116 }
118 /* Use the configured timespans or fall back to the built-in defaults */
119 if (rra_timespans_custom_num != 0)
120 {
121 rts = rra_timespans_custom;
122 rts_num = rra_timespans_custom_num;
123 }
124 else
125 {
126 rts = rra_timespans;
127 rts_num = rra_timespans_num;
128 }
130 rra_max = rts_num * rra_types_num;
132 if ((rra_def = (char **) malloc ((rra_max + 1) * sizeof (char *))) == NULL)
133 return (-1);
134 memset (rra_def, '\0', (rra_max + 1) * sizeof (char *));
136 if ((stepsize <= 0) || (rrarows <= 0))
137 {
138 *ret = NULL;
139 return (-1);
140 }
142 cdp_len = 0;
143 for (i = 0; i < rts_num; i++)
144 {
145 span = rts[i];
147 if ((span / stepsize) < rrarows)
148 continue;
150 if (cdp_len == 0)
151 cdp_len = 1;
152 else
153 cdp_len = (int) floor (((double) span)
154 / ((double) (rrarows * stepsize)));
156 cdp_num = (int) ceil (((double) span)
157 / ((double) (cdp_len * stepsize)));
159 for (j = 0; j < rra_types_num; j++)
160 {
161 if (rra_num >= rra_max)
162 break;
164 if (snprintf (buffer, sizeof (buffer), "RRA:%s:%3.1f:%u:%u",
165 rra_types[j], xff,
166 cdp_len, cdp_num) >= sizeof (buffer))
167 {
168 ERROR ("rra_get: Buffer would have been truncated.");
169 continue;
170 }
172 rra_def[rra_num++] = sstrdup (buffer);
173 }
174 }
176 #if COLLECT_DEBUG
177 DEBUG ("rra_num = %i", rra_num);
178 for (i = 0; i < rra_num; i++)
179 DEBUG (" %s", rra_def[i]);
180 #endif
182 *ret = rra_def;
183 return (rra_num);
184 }
186 static void ds_free (int ds_num, char **ds_def)
187 {
188 int i;
190 for (i = 0; i < ds_num; i++)
191 if (ds_def[i] != NULL)
192 free (ds_def[i]);
193 free (ds_def);
194 }
196 static int ds_get (char ***ret, const data_set_t *ds)
197 {
198 char **ds_def;
199 int ds_num;
201 char min[32];
202 char max[32];
203 char buffer[128];
205 DEBUG ("ds->ds_num = %i", ds->ds_num);
207 ds_def = (char **) malloc (ds->ds_num * sizeof (char *));
208 if (ds_def == NULL)
209 {
210 char errbuf[1024];
211 ERROR ("rrdtool plugin: malloc failed: %s",
212 sstrerror (errno, errbuf, sizeof (errbuf)));
213 return (-1);
214 }
215 memset (ds_def, '\0', ds->ds_num * sizeof (char *));
217 for (ds_num = 0; ds_num < ds->ds_num; ds_num++)
218 {
219 data_source_t *d = ds->ds + ds_num;
220 char *type;
221 int status;
223 ds_def[ds_num] = NULL;
225 if (d->type == DS_TYPE_COUNTER)
226 type = "COUNTER";
227 else if (d->type == DS_TYPE_GAUGE)
228 type = "GAUGE";
229 else
230 {
231 ERROR ("rrdtool plugin: Unknown DS type: %i",
232 d->type);
233 break;
234 }
236 if (isnan (d->min))
237 {
238 strcpy (min, "U");
239 }
240 else
241 {
242 snprintf (min, sizeof (min), "%lf", d->min);
243 min[sizeof (min) - 1] = '\0';
244 }
246 if (isnan (d->max))
247 {
248 strcpy (max, "U");
249 }
250 else
251 {
252 snprintf (max, sizeof (max), "%lf", d->max);
253 max[sizeof (max) - 1] = '\0';
254 }
256 status = snprintf (buffer, sizeof (buffer),
257 "DS:%s:%s:%i:%s:%s",
258 d->name, type, heartbeat,
259 min, max);
260 if ((status < 1) || (status >= sizeof (buffer)))
261 break;
263 ds_def[ds_num] = sstrdup (buffer);
264 } /* for ds_num = 0 .. ds->ds_num */
266 #if COLLECT_DEBUG
267 {
268 int i;
269 DEBUG ("ds_num = %i", ds_num);
270 for (i = 0; i < ds_num; i++)
271 DEBUG (" %s", ds_def[i]);
272 }
273 #endif
275 if (ds_num != ds->ds_num)
276 {
277 ds_free (ds_num, ds_def);
278 return (-1);
279 }
281 *ret = ds_def;
282 return (ds_num);
283 }
285 static int rrd_create_file (char *filename, const data_set_t *ds)
286 {
287 char **argv;
288 int argc;
289 char **rra_def;
290 int rra_num;
291 char **ds_def;
292 int ds_num;
293 int i, j;
294 char stepsize_str[16];
295 int status = 0;
297 if (check_create_dir (filename))
298 return (-1);
300 if ((rra_num = rra_get (&rra_def)) < 1)
301 {
302 ERROR ("rrd_create_file failed: Could not calculate RRAs");
303 return (-1);
304 }
306 if ((ds_num = ds_get (&ds_def, ds)) < 1)
307 {
308 ERROR ("rrd_create_file failed: Could not calculate DSes");
309 return (-1);
310 }
312 argc = ds_num + rra_num + 4;
314 if ((argv = (char **) malloc (sizeof (char *) * (argc + 1))) == NULL)
315 {
316 char errbuf[1024];
317 ERROR ("rrd_create failed: %s",
318 sstrerror (errno, errbuf, sizeof (errbuf)));
319 return (-1);
320 }
322 status = snprintf (stepsize_str, sizeof (stepsize_str),
323 "%i", stepsize);
324 if ((status < 1) || (status >= sizeof (stepsize_str)))
325 {
326 ERROR ("rrdtool plugin: snprintf failed.");
327 return (-1);
328 }
330 argv[0] = "create";
331 argv[1] = filename;
332 argv[2] = "-s";
333 argv[3] = stepsize_str;
335 j = 4;
336 for (i = 0; i < ds_num; i++)
337 argv[j++] = ds_def[i];
338 for (i = 0; i < rra_num; i++)
339 argv[j++] = rra_def[i];
340 argv[j] = NULL;
342 optind = 0; /* bug in librrd? */
343 rrd_clear_error ();
344 if (rrd_create (argc, argv) == -1)
345 {
346 ERROR ("rrd_create failed: %s: %s", filename, rrd_get_error ());
347 status = -1;
348 }
350 free (argv);
351 ds_free (ds_num, ds_def);
353 return (status);
354 }
356 static int value_list_to_string (char *buffer, int buffer_len,
357 const data_set_t *ds, const value_list_t *vl)
358 {
359 int offset;
360 int status;
361 int i;
363 memset (buffer, '\0', sizeof (buffer_len));
365 status = snprintf (buffer, buffer_len, "%u", (unsigned int) vl->time);
366 if ((status < 1) || (status >= buffer_len))
367 return (-1);
368 offset = status;
370 for (i = 0; i < ds->ds_num; i++)
371 {
372 if ((ds->ds[i].type != DS_TYPE_COUNTER)
373 && (ds->ds[i].type != DS_TYPE_GAUGE))
374 return (-1);
376 if (ds->ds[i].type == DS_TYPE_COUNTER)
377 status = snprintf (buffer + offset, buffer_len - offset,
378 ":%llu", vl->values[i].counter);
379 else
380 status = snprintf (buffer + offset, buffer_len - offset,
381 ":%lf", vl->values[i].gauge);
383 if ((status < 1) || (status >= (buffer_len - offset)))
384 return (-1);
386 offset += status;
387 } /* for ds->ds_num */
389 return (0);
390 } /* int value_list_to_string */
392 static int value_list_to_filename (char *buffer, int buffer_len,
393 const data_set_t *ds, const value_list_t *vl)
394 {
395 int offset = 0;
396 int status;
398 if (datadir != NULL)
399 {
400 status = snprintf (buffer + offset, buffer_len - offset,
401 "%s/", datadir);
402 if ((status < 1) || (status >= buffer_len - offset))
403 return (-1);
404 offset += status;
405 }
407 status = snprintf (buffer + offset, buffer_len - offset,
408 "%s/", vl->host);
409 if ((status < 1) || (status >= buffer_len - offset))
410 return (-1);
411 offset += status;
413 if (strlen (vl->plugin_instance) > 0)
414 status = snprintf (buffer + offset, buffer_len - offset,
415 "%s-%s/", vl->plugin, vl->plugin_instance);
416 else
417 status = snprintf (buffer + offset, buffer_len - offset,
418 "%s/", vl->plugin);
419 if ((status < 1) || (status >= buffer_len - offset))
420 return (-1);
421 offset += status;
423 if (strlen (vl->type_instance) > 0)
424 status = snprintf (buffer + offset, buffer_len - offset,
425 "%s-%s.rrd", ds->type, vl->type_instance);
426 else
427 status = snprintf (buffer + offset, buffer_len - offset,
428 "%s.rrd", ds->type);
429 if ((status < 1) || (status >= buffer_len - offset))
430 return (-1);
431 offset += status;
433 return (0);
434 } /* int value_list_to_filename */
436 static rrd_cache_t *rrd_cache_insert (const char *filename,
437 const char *value)
438 {
439 rrd_cache_t *rc = NULL;
440 int new_rc = 0;
442 if (cache != NULL)
443 avl_get (cache, filename, (void *) &rc);
445 if (rc == NULL)
446 {
447 rc = (rrd_cache_t *) malloc (sizeof (rrd_cache_t));
448 if (rc == NULL)
449 return (NULL);
450 rc->values_num = 0;
451 rc->values = NULL;
452 rc->first_value = 0;
453 new_rc = 1;
454 }
456 rc->values = (char **) realloc ((void *) rc->values,
457 (rc->values_num + 1) * sizeof (char *));
458 if (rc->values == NULL)
459 {
460 char errbuf[1024];
461 ERROR ("rrdtool plugin: realloc failed: %s",
462 sstrerror (errno, errbuf, sizeof (errbuf)));
463 if (cache != NULL)
464 {
465 void *cache_key = NULL;
466 avl_remove (cache, filename, &cache_key, NULL);
467 sfree (cache_key);
468 }
469 free (rc);
470 return (NULL);
471 }
473 rc->values[rc->values_num] = strdup (value);
474 if (rc->values[rc->values_num] != NULL)
475 rc->values_num++;
477 if (rc->values_num == 1)
478 rc->first_value = time (NULL);
480 /* Insert if this is the first value */
481 if ((cache != NULL) && (new_rc == 1))
482 {
483 void *cache_key = strdup (filename);
485 if (cache_key == NULL)
486 {
487 char errbuf[1024];
488 ERROR ("rrdtool plugin: strdup failed: %s",
489 sstrerror (errno, errbuf, sizeof (errbuf)));
490 sfree (rc->values[0]);
491 sfree (rc->values);
492 sfree (rc);
493 return (NULL);
494 }
496 avl_insert (cache, cache_key, rc);
497 }
499 DEBUG ("rrd_cache_insert (%s, %s) = %p", filename, value, (void *) rc);
501 return (rc);
502 } /* rrd_cache_t *rrd_cache_insert */
504 static int rrd_write_cache_entry (const char *filename, rrd_cache_t *rc)
505 {
506 char **argv;
507 int argc;
509 char *fn;
510 int status;
512 int i;
514 if (rc->values_num < 1)
515 return (0);
517 argc = rc->values_num + 2;
518 argv = (char **) malloc ((argc + 1) * sizeof (char *));
519 if (argv == NULL)
520 return (-1);
522 fn = strdup (filename);
523 if (fn == NULL)
524 {
525 free (argv);
526 return (-1);
527 }
529 argv[0] = "update";
530 argv[1] = fn;
531 memcpy (argv + 2, rc->values, rc->values_num * sizeof (char *));
532 argv[argc] = NULL;
534 DEBUG ("rrd_update (argc = %i, argv = %p)", argc, (void *) argv);
536 optind = 0; /* bug in librrd? */
537 rrd_clear_error ();
538 status = rrd_update (argc, argv);
539 if (status != 0)
540 {
541 WARNING ("rrd_update failed: %s: %s",
542 filename, rrd_get_error ());
543 status = -1;
544 }
546 free (argv);
547 free (fn);
548 /* Free the value list of `rc' */
549 for (i = 0; i < rc->values_num; i++)
550 free (rc->values[i]);
551 free (rc->values);
552 rc->values = NULL;
553 rc->values_num = 0;
555 return (status);
556 } /* int rrd_write_cache_entry */
558 static void rrd_cache_flush (int timeout)
559 {
560 rrd_cache_t *rc;
561 time_t now;
563 char **keys = NULL;
564 int keys_num = 0;
566 char *key;
567 avl_iterator_t *iter;
568 int i;
570 if (cache == NULL)
571 return;
573 DEBUG ("Flushing cache, timeout = %i", timeout);
575 now = time (NULL);
577 /* Build a list of entries to be flushed */
578 iter = avl_get_iterator (cache);
579 while (avl_iterator_next (iter, (void *) &key, (void *) &rc) == 0)
580 {
581 DEBUG ("key = %s; age = %i;", key, now - rc->first_value);
582 if ((now - rc->first_value) >= timeout)
583 {
584 keys = (char **) realloc ((void *) keys,
585 (keys_num + 1) * sizeof (char *));
586 if (keys == NULL)
587 {
588 char errbuf[1024];
589 ERROR ("rrdtool plugin: "
590 "realloc failed: %s",
591 sstrerror (errno, errbuf,
592 sizeof (errbuf)));
593 avl_iterator_destroy (iter);
594 return;
595 }
596 keys[keys_num] = key;
597 keys_num++;
598 }
599 } /* while (avl_iterator_next) */
600 avl_iterator_destroy (iter);
602 for (i = 0; i < keys_num; i++)
603 {
604 if (avl_remove (cache, keys[i], (void *) &key, (void *) &rc) != 0)
605 {
606 DEBUG ("avl_remove (%s) failed.", keys[i]);
607 continue;
608 }
610 rrd_write_cache_entry (keys[i], rc);
611 /* rc's value-list is free's by `rrd_write_cache_entry' */
612 sfree (rc);
613 sfree (key);
614 keys[i] = NULL;
615 } /* for (i = 0..keys_num) */
617 free (keys);
618 DEBUG ("Flushed %i value(s)", keys_num);
620 cache_flush_last = now;
621 } /* void rrd_cache_flush */
623 static int rrd_write (const data_set_t *ds, const value_list_t *vl)
624 {
625 struct stat statbuf;
626 char filename[512];
627 char values[512];
628 rrd_cache_t *rc;
629 time_t now;
631 if (value_list_to_filename (filename, sizeof (filename), ds, vl) != 0)
632 return (-1);
634 if (value_list_to_string (values, sizeof (values), ds, vl) != 0)
635 return (-1);
637 if (stat (filename, &statbuf) == -1)
638 {
639 if (errno == ENOENT)
640 {
641 if (rrd_create_file (filename, ds))
642 return (-1);
643 }
644 else
645 {
646 char errbuf[1024];
647 ERROR ("stat(%s) failed: %s", filename,
648 sstrerror (errno, errbuf,
649 sizeof (errbuf)));
650 return (-1);
651 }
652 }
653 else if (!S_ISREG (statbuf.st_mode))
654 {
655 ERROR ("stat(%s): Not a regular file!",
656 filename);
657 return (-1);
658 }
660 pthread_mutex_lock (&cache_lock);
661 rc = rrd_cache_insert (filename, values);
662 if (rc == NULL)
663 {
664 pthread_mutex_unlock (&cache_lock);
665 return (-1);
666 }
668 if (cache == NULL)
669 {
670 rrd_write_cache_entry (filename, rc);
671 /* rc's value-list is free's by `rrd_write_cache_entry' */
672 sfree (rc);
673 pthread_mutex_unlock (&cache_lock);
674 return (0);
675 }
677 now = time (NULL);
679 DEBUG ("age (%s) = %i", filename, now - rc->first_value);
681 /* `rc' is not free'd here, because we'll likely reuse it. If not, then
682 * the next flush will remove this entry. */
683 if ((now - rc->first_value) >= cache_timeout)
684 rrd_write_cache_entry (filename, rc);
686 if ((now - cache_flush_last) >= cache_flush_timeout)
687 rrd_cache_flush (cache_flush_timeout);
689 pthread_mutex_unlock (&cache_lock);
690 return (0);
691 } /* int rrd_write */
693 static int rrd_config (const char *key, const char *value)
694 {
695 if (strcasecmp ("CacheTimeout", key) == 0)
696 {
697 int tmp = atoi (value);
698 if (tmp < 0)
699 {
700 fprintf (stderr, "rrdtool: `CacheTimeout' must "
701 "be greater than 0.\n");
702 return (1);
703 }
704 cache_timeout = tmp;
705 }
706 else if (strcasecmp ("CacheFlush", key) == 0)
707 {
708 int tmp = atoi (value);
709 if (tmp < 0)
710 {
711 fprintf (stderr, "rrdtool: `CacheFlush' must "
712 "be greater than 0.\n");
713 return (1);
714 }
715 cache_flush_timeout = tmp;
716 }
717 else if (strcasecmp ("DataDir", key) == 0)
718 {
719 if (datadir != NULL)
720 free (datadir);
721 datadir = strdup (value);
722 if (datadir != NULL)
723 {
724 int len = strlen (datadir);
725 while ((len > 0) && (datadir[len - 1] == '/'))
726 {
727 len--;
728 datadir[len] = '\0';
729 }
730 if (len <= 0)
731 {
732 free (datadir);
733 datadir = NULL;
734 }
735 }
736 }
737 else if (strcasecmp ("StepSize", key) == 0)
738 {
739 int tmp = atoi (value);
740 if (tmp <= 0)
741 {
742 fprintf (stderr, "rrdtool: `StepSize' must "
743 "be greater than 0.\n");
744 return (1);
745 }
746 stepsize = tmp;
747 }
748 else if (strcasecmp ("HeartBeat", key) == 0)
749 {
750 int tmp = atoi (value);
751 if (tmp <= 0)
752 {
753 fprintf (stderr, "rrdtool: `HeartBeat' must "
754 "be greater than 0.\n");
755 return (1);
756 }
757 heartbeat = tmp;
758 }
759 else if (strcasecmp ("RRARows", key) == 0)
760 {
761 int tmp = atoi (value);
762 if (tmp <= 0)
763 {
764 fprintf (stderr, "rrdtool: `RRARows' must "
765 "be greater than 0.\n");
766 return (1);
767 }
768 rrarows = tmp;
769 }
770 else if (strcasecmp ("RRATimespan", key) == 0)
771 {
772 char *saveptr = NULL;
773 char *dummy;
774 char *ptr;
775 int *tmp_alloc;
777 dummy = value;
778 while ((ptr = strtok_r (dummy, ", \t", &saveptr)) != NULL)
779 {
780 dummy = NULL;
782 tmp_alloc = realloc (rra_timespans_custom,
783 sizeof (int) * (rra_timespans_custom_num + 1));
784 if (tmp_alloc == NULL)
785 {
786 fprintf (stderr, "rrdtool: realloc failed.\n");
787 return (1);
788 }
789 rra_timespans_custom = tmp_alloc;
790 rra_timespans_custom[rra_timespans_custom_num] = atoi (ptr);
791 if (rra_timespans_custom[rra_timespans_custom_num] != 0)
792 rra_timespans_custom_num++;
793 } /* while (strtok_r) */
795 }
796 else if (strcasecmp ("XFF", key) == 0)
797 {
798 double tmp = atof (value);
799 if ((tmp < 0.0) || (tmp >= 1.0))
800 {
801 fprintf (stderr, "rrdtool: `XFF' must "
802 "be in the range 0 to 1 (exclusive).");
803 return (1);
804 }
805 xff = tmp;
806 }
807 else
808 {
809 return (-1);
810 }
811 return (0);
812 } /* int rrd_config */
814 static int rrd_shutdown (void)
815 {
816 pthread_mutex_lock (&cache_lock);
817 rrd_cache_flush (-1);
818 if (cache != NULL)
819 avl_destroy (cache);
820 cache = NULL;
821 pthread_mutex_unlock (&cache_lock);
823 return (0);
824 } /* int rrd_shutdown */
826 static int rrd_init (void)
827 {
828 if (stepsize <= 0)
829 stepsize = interval_g;
830 if (heartbeat <= 0)
831 heartbeat = 2 * interval_g;
833 if (heartbeat < interval_g)
834 WARNING ("rrdtool plugin: Your `heartbeat' is "
835 "smaller than your `interval'. This will "
836 "likely cause problems.");
837 else if (stepsize < interval_g)
838 WARNING ("rrdtool plugin: Your `stepsize' is "
839 "smaller than your `interval'. This will "
840 "create needlessly big RRD-files.");
842 pthread_mutex_lock (&cache_lock);
843 if (cache_timeout < 2)
844 {
845 cache_timeout = 0;
846 cache_flush_timeout = 0;
847 }
848 else
849 {
850 if (cache_flush_timeout < cache_timeout)
851 cache_flush_timeout = 10 * cache_timeout;
853 cache = avl_create ((int (*) (const void *, const void *)) strcmp);
854 cache_flush_last = time (NULL);
855 plugin_register_shutdown ("rrdtool", rrd_shutdown);
856 }
857 pthread_mutex_unlock (&cache_lock);
859 DEBUG ("rrdtool plugin: rrd_init: datadir = %s; stepsize = %i;"
860 " heartbeat = %i; rrarows = %i; xff = %lf;",
861 (datadir == NULL) ? "(null)" : datadir,
862 stepsize, heartbeat, rrarows, xff);
864 return (0);
865 } /* int rrd_init */
867 void module_register (modreg_e load)
868 {
869 plugin_register_config ("rrdtool", rrd_config,
870 config_keys, config_keys_num);
871 plugin_register_init ("rrdtool", rrd_init);
872 plugin_register_write ("rrdtool", rrd_write);
873 }