2 * collectd - src/rrdtool.c
3 * Copyright (C) 2006-2008 Florian octo Forster
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.
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.
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
19 * Florian octo Forster <octo at verplant.org>
25 #include "utils_avltree.h"
26 #include "utils_rrdcreate.h"
50 typedef struct rrd_cache_s rrd_cache_t;
57 typedef enum rrd_queue_dir_e rrd_queue_dir_t;
62 struct rrd_queue_s *next;
64 typedef struct rrd_queue_s rrd_queue_t;
69 static const char *config_keys[] =
81 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
83 /* If datadir is zero, the daemon's basedir is used. If stepsize or heartbeat
84 * is zero a default, depending on the `interval' member of the value list is
86 static char *datadir = NULL;
87 static double write_rate = 0.0;
88 static rrdcreate_config_t rrdcreate_config =
95 /* timespans = */ NULL,
96 /* timespans_num = */ 0,
98 /* consolidation_functions = */ NULL,
99 /* consolidation_functions_num = */ 0
102 /* XXX: If you need to lock both, cache_lock and queue_lock, at the same time,
103 * ALWAYS lock `cache_lock' first! */
104 static int cache_timeout = 0;
105 static int cache_flush_timeout = 0;
106 static time_t cache_flush_last;
107 static c_avl_tree_t *cache = NULL;
108 static pthread_mutex_t cache_lock = PTHREAD_MUTEX_INITIALIZER;
110 static rrd_queue_t *queue_head = NULL;
111 static rrd_queue_t *queue_tail = NULL;
112 static rrd_queue_t *flushq_head = NULL;
113 static rrd_queue_t *flushq_tail = NULL;
114 static pthread_t queue_thread;
115 static int queue_thread_running = 1;
116 static pthread_mutex_t queue_lock = PTHREAD_MUTEX_INITIALIZER;
117 static pthread_cond_t queue_cond = PTHREAD_COND_INITIALIZER;
119 #if !HAVE_THREADSAFE_LIBRRD
120 static pthread_mutex_t librrd_lock = PTHREAD_MUTEX_INITIALIZER;
123 static int do_shutdown = 0;
125 #if HAVE_THREADSAFE_LIBRRD
126 static int srrd_update (char *filename, char *template,
127 int argc, const char **argv)
131 optind = 0; /* bug in librrd? */
134 status = rrd_update_r (filename, template, argc, (void *) argv);
138 WARNING ("rrdtool plugin: rrd_update_r (%s) failed: %s",
139 filename, rrd_get_error ());
143 } /* int srrd_update */
144 /* #endif HAVE_THREADSAFE_LIBRRD */
146 #else /* !HAVE_THREADSAFE_LIBRRD */
147 static int srrd_update (char *filename, char *template,
148 int argc, const char **argv)
155 assert (template == NULL);
158 new_argv = (char **) malloc ((new_argc + 1) * sizeof (char *));
159 if (new_argv == NULL)
161 ERROR ("rrdtool plugin: malloc failed.");
165 new_argv[0] = "update";
166 new_argv[1] = filename;
168 memcpy (new_argv + 2, argv, argc * sizeof (char *));
169 new_argv[new_argc] = NULL;
171 pthread_mutex_lock (&librrd_lock);
172 optind = 0; /* bug in librrd? */
175 status = rrd_update (new_argc, new_argv);
176 pthread_mutex_unlock (&librrd_lock);
180 WARNING ("rrdtool plugin: rrd_update_r failed: %s: %s",
181 argv[1], rrd_get_error ());
187 } /* int srrd_update */
188 #endif /* !HAVE_THREADSAFE_LIBRRD */
190 static int value_list_to_string (char *buffer, int buffer_len,
191 const data_set_t *ds, const value_list_t *vl)
197 memset (buffer, '\0', buffer_len);
199 status = ssnprintf (buffer, buffer_len, "%u", (unsigned int) vl->time);
200 if ((status < 1) || (status >= buffer_len))
204 for (i = 0; i < ds->ds_num; i++)
206 if ((ds->ds[i].type != DS_TYPE_COUNTER)
207 && (ds->ds[i].type != DS_TYPE_GAUGE))
210 if (ds->ds[i].type == DS_TYPE_COUNTER)
211 status = ssnprintf (buffer + offset, buffer_len - offset,
212 ":%llu", vl->values[i].counter);
214 status = ssnprintf (buffer + offset, buffer_len - offset,
215 ":%lf", vl->values[i].gauge);
217 if ((status < 1) || (status >= (buffer_len - offset)))
221 } /* for ds->ds_num */
224 } /* int value_list_to_string */
226 static int value_list_to_filename (char *buffer, int buffer_len,
227 const data_set_t __attribute__((unused)) *ds, const value_list_t *vl)
234 status = ssnprintf (buffer + offset, buffer_len - offset,
236 if ((status < 1) || (status >= buffer_len - offset))
241 status = ssnprintf (buffer + offset, buffer_len - offset,
243 if ((status < 1) || (status >= buffer_len - offset))
247 if (strlen (vl->plugin_instance) > 0)
248 status = ssnprintf (buffer + offset, buffer_len - offset,
249 "%s-%s/", vl->plugin, vl->plugin_instance);
251 status = ssnprintf (buffer + offset, buffer_len - offset,
253 if ((status < 1) || (status >= buffer_len - offset))
257 if (strlen (vl->type_instance) > 0)
258 status = ssnprintf (buffer + offset, buffer_len - offset,
259 "%s-%s.rrd", vl->type, vl->type_instance);
261 status = ssnprintf (buffer + offset, buffer_len - offset,
263 if ((status < 1) || (status >= buffer_len - offset))
268 } /* int value_list_to_filename */
270 static void *rrd_queue_thread (void __attribute__((unused)) *data)
272 struct timeval tv_next_update;
273 struct timeval tv_now;
275 gettimeofday (&tv_next_update, /* timezone = */ NULL);
279 rrd_queue_t *queue_entry;
280 rrd_cache_t *cache_entry;
286 pthread_mutex_lock (&queue_lock);
287 /* Wait for values to arrive */
290 struct timespec ts_wait;
292 while ((flushq_head == NULL) && (queue_head == NULL)
293 && (do_shutdown == 0))
294 pthread_cond_wait (&queue_cond, &queue_lock);
296 if ((flushq_head == NULL) && (queue_head == NULL))
299 /* Don't delay if there's something to flush */
300 if (flushq_head != NULL)
303 /* Don't delay if we're shutting down */
304 if (do_shutdown != 0)
307 /* Don't delay if no delay was configured. */
308 if (write_rate <= 0.0)
311 gettimeofday (&tv_now, /* timezone = */ NULL);
312 status = timeval_cmp (tv_next_update, tv_now, NULL);
313 /* We're good to go */
317 /* We're supposed to wait a bit with this update, so we'll
318 * wait for the next addition to the queue or to the end of
319 * the wait period - whichever comes first. */
320 ts_wait.tv_sec = tv_next_update.tv_sec;
321 ts_wait.tv_nsec = 1000 * tv_next_update.tv_usec;
323 status = pthread_cond_timedwait (&queue_cond, &queue_lock,
325 if (status == ETIMEDOUT)
329 /* XXX: If you need to lock both, cache_lock and queue_lock, at
330 * the same time, ALWAYS lock `cache_lock' first! */
332 /* We're in the shutdown phase */
333 if ((flushq_head == NULL) && (queue_head == NULL))
335 pthread_mutex_unlock (&queue_lock);
339 if (flushq_head != NULL)
341 /* Dequeue the first flush entry */
342 queue_entry = flushq_head;
343 if (flushq_head == flushq_tail)
344 flushq_head = flushq_tail = NULL;
346 flushq_head = flushq_head->next;
348 else /* if (queue_head != NULL) */
350 /* Dequeue the first regular entry */
351 queue_entry = queue_head;
352 if (queue_head == queue_tail)
353 queue_head = queue_tail = NULL;
355 queue_head = queue_head->next;
358 /* Unlock the queue again */
359 pthread_mutex_unlock (&queue_lock);
361 /* We now need the cache lock so the entry isn't updated while
362 * we make a copy of it's values */
363 pthread_mutex_lock (&cache_lock);
365 status = c_avl_get (cache, queue_entry->filename,
366 (void *) &cache_entry);
370 values = cache_entry->values;
371 values_num = cache_entry->values_num;
373 cache_entry->values = NULL;
374 cache_entry->values_num = 0;
375 cache_entry->flags = FLAG_NONE;
378 pthread_mutex_unlock (&cache_lock);
382 sfree (queue_entry->filename);
387 /* Update `tv_next_update' */
388 if (write_rate > 0.0)
390 gettimeofday (&tv_now, /* timezone = */ NULL);
391 tv_next_update.tv_sec = tv_now.tv_sec;
392 tv_next_update.tv_usec = tv_now.tv_usec
393 + ((suseconds_t) (1000000 * write_rate));
394 while (tv_next_update.tv_usec > 1000000)
396 tv_next_update.tv_sec++;
397 tv_next_update.tv_usec -= 1000000;
401 /* Write the values to the RRD-file */
402 srrd_update (queue_entry->filename, NULL,
403 values_num, (const char **)values);
404 DEBUG ("rrdtool plugin: queue thread: Wrote %i value%s to %s",
405 values_num, (values_num == 1) ? "" : "s",
406 queue_entry->filename);
408 for (i = 0; i < values_num; i++)
413 sfree (queue_entry->filename);
417 pthread_mutex_lock (&cache_lock);
418 c_avl_destroy (cache);
420 pthread_mutex_unlock (&cache_lock);
422 pthread_exit ((void *) 0);
424 } /* void *rrd_queue_thread */
426 static int rrd_queue_enqueue (const char *filename,
427 rrd_queue_t **head, rrd_queue_t **tail)
429 rrd_queue_t *queue_entry;
431 queue_entry = (rrd_queue_t *) malloc (sizeof (rrd_queue_t));
432 if (queue_entry == NULL)
435 queue_entry->filename = strdup (filename);
436 if (queue_entry->filename == NULL)
442 queue_entry->next = NULL;
444 pthread_mutex_lock (&queue_lock);
449 (*tail)->next = queue_entry;
452 pthread_cond_signal (&queue_cond);
453 pthread_mutex_unlock (&queue_lock);
456 } /* int rrd_queue_enqueue */
458 static int rrd_queue_dequeue (const char *filename,
459 rrd_queue_t **head, rrd_queue_t **tail)
464 pthread_mutex_lock (&queue_lock);
471 if (strcmp (this->filename, filename) == 0)
480 pthread_mutex_unlock (&queue_lock);
487 prev->next = this->next;
489 if (this->next == NULL)
492 pthread_mutex_unlock (&queue_lock);
494 sfree (this->filename);
498 } /* int rrd_queue_dequeue */
500 static void rrd_cache_flush (int timeout)
509 c_avl_iterator_t *iter;
512 DEBUG ("rrdtool plugin: Flushing cache, timeout = %i", timeout);
516 /* Build a list of entries to be flushed */
517 iter = c_avl_get_iterator (cache);
518 while (c_avl_iterator_next (iter, (void *) &key, (void *) &rc) == 0)
520 if (rc->flags != FLAG_NONE)
522 else if ((now - rc->first_value) < timeout)
524 else if (rc->values_num > 0)
528 status = rrd_queue_enqueue (key, &queue_head, &queue_tail);
530 rc->flags = FLAG_QUEUED;
532 else /* ancient and no values -> waste of memory */
534 char **tmp = (char **) realloc ((void *) keys,
535 (keys_num + 1) * sizeof (char *));
539 ERROR ("rrdtool plugin: "
540 "realloc failed: %s",
541 sstrerror (errno, errbuf,
543 c_avl_iterator_destroy (iter);
548 keys[keys_num] = key;
551 } /* while (c_avl_iterator_next) */
552 c_avl_iterator_destroy (iter);
554 for (i = 0; i < keys_num; i++)
556 if (c_avl_remove (cache, keys[i], (void *) &key, (void *) &rc) != 0)
558 DEBUG ("rrdtool plugin: c_avl_remove (%s) failed.", keys[i]);
562 assert (rc->values == NULL);
563 assert (rc->values_num == 0);
568 } /* for (i = 0..keys_num) */
572 cache_flush_last = now;
573 } /* void rrd_cache_flush */
575 static int rrd_cache_flush_identifier (int timeout, const char *identifier)
582 if (identifier == NULL)
584 rrd_cache_flush (timeout);
591 snprintf (key, sizeof (key), "%s.rrd",
594 snprintf (key, sizeof (key), "%s/%s.rrd",
595 datadir, identifier);
596 key[sizeof (key) - 1] = 0;
598 status = c_avl_get (cache, key, (void *) &rc);
601 WARNING ("rrdtool plugin: rrd_cache_flush_identifier: "
602 "c_avl_get (%s) failed. Does that file really exist?",
607 if (rc->flags == FLAG_FLUSHQ)
611 else if (rc->flags == FLAG_QUEUED)
613 rrd_queue_dequeue (key, &queue_head, &queue_tail);
614 status = rrd_queue_enqueue (key, &flushq_head, &flushq_tail);
616 rc->flags = FLAG_FLUSHQ;
618 else if ((now - rc->first_value) < timeout)
622 else if (rc->values_num > 0)
624 status = rrd_queue_enqueue (key, &flushq_head, &flushq_tail);
626 rc->flags = FLAG_FLUSHQ;
630 } /* int rrd_cache_flush_identifier */
632 static int rrd_cache_insert (const char *filename,
633 const char *value, time_t value_time)
635 rrd_cache_t *rc = NULL;
639 pthread_mutex_lock (&cache_lock);
641 /* This shouldn't happen, but it did happen at least once, so we'll be
645 pthread_mutex_unlock (&cache_lock);
646 WARNING ("rrdtool plugin: cache == NULL.");
650 c_avl_get (cache, filename, (void *) &rc);
654 rc = (rrd_cache_t *) malloc (sizeof (rrd_cache_t));
661 rc->flags = FLAG_NONE;
665 if (rc->last_value >= value_time)
667 pthread_mutex_unlock (&cache_lock);
668 WARNING ("rrdtool plugin: (rc->last_value = %u) >= (value_time = %u)",
669 (unsigned int) rc->last_value,
670 (unsigned int) value_time);
674 values_new = (char **) realloc ((void *) rc->values,
675 (rc->values_num + 1) * sizeof (char *));
676 if (values_new == NULL)
679 void *cache_key = NULL;
681 sstrerror (errno, errbuf, sizeof (errbuf));
683 c_avl_remove (cache, filename, &cache_key, NULL);
684 pthread_mutex_unlock (&cache_lock);
686 ERROR ("rrdtool plugin: realloc failed: %s", errbuf);
693 rc->values = values_new;
695 rc->values[rc->values_num] = strdup (value);
696 if (rc->values[rc->values_num] != NULL)
699 if (rc->values_num == 1)
700 rc->first_value = value_time;
701 rc->last_value = value_time;
703 /* Insert if this is the first value */
706 void *cache_key = strdup (filename);
708 if (cache_key == NULL)
711 sstrerror (errno, errbuf, sizeof (errbuf));
713 pthread_mutex_unlock (&cache_lock);
715 ERROR ("rrdtool plugin: strdup failed: %s", errbuf);
717 sfree (rc->values[0]);
723 c_avl_insert (cache, cache_key, rc);
726 DEBUG ("rrdtool plugin: rrd_cache_insert: file = %s; "
727 "values_num = %i; age = %lu;",
728 filename, rc->values_num,
729 (unsigned long)(rc->last_value - rc->first_value));
731 if ((rc->last_value - rc->first_value) >= cache_timeout)
733 /* XXX: If you need to lock both, cache_lock and queue_lock, at
734 * the same time, ALWAYS lock `cache_lock' first! */
735 if (rc->flags == FLAG_NONE)
739 status = rrd_queue_enqueue (filename, &queue_head, &queue_tail);
741 rc->flags = FLAG_QUEUED;
745 DEBUG ("rrdtool plugin: `%s' is already queued.", filename);
749 if ((cache_timeout > 0) &&
750 ((time (NULL) - cache_flush_last) > cache_flush_timeout))
751 rrd_cache_flush (cache_flush_timeout);
753 pthread_mutex_unlock (&cache_lock);
756 } /* int rrd_cache_insert */
758 static int rrd_compare_numeric (const void *a_ptr, const void *b_ptr)
760 int a = *((int *) a_ptr);
761 int b = *((int *) b_ptr);
769 } /* int rrd_compare_numeric */
771 static int rrd_write (const data_set_t *ds, const value_list_t *vl,
772 user_data_t __attribute__((unused)) *user_data)
779 if (0 != strcmp (ds->type, vl->type)) {
780 ERROR ("rrdtool plugin: DS type does not match value list type");
784 if (value_list_to_filename (filename, sizeof (filename), ds, vl) != 0)
787 if (value_list_to_string (values, sizeof (values), ds, vl) != 0)
790 if (stat (filename, &statbuf) == -1)
794 status = cu_rrd_create_file (filename,
795 ds, vl, &rrdcreate_config);
802 ERROR ("stat(%s) failed: %s", filename,
803 sstrerror (errno, errbuf,
808 else if (!S_ISREG (statbuf.st_mode))
810 ERROR ("stat(%s): Not a regular file!",
815 status = rrd_cache_insert (filename, values, vl->time);
818 } /* int rrd_write */
820 static int rrd_flush (int timeout, const char *identifier,
821 user_data_t __attribute__((unused)) *user_data)
823 pthread_mutex_lock (&cache_lock);
826 pthread_mutex_unlock (&cache_lock);
830 rrd_cache_flush_identifier (timeout, identifier);
832 pthread_mutex_unlock (&cache_lock);
834 } /* int rrd_flush */
836 static int rrd_config (const char *key, const char *value)
838 if (strcasecmp ("CacheTimeout", key) == 0)
840 int tmp = atoi (value);
843 fprintf (stderr, "rrdtool: `CacheTimeout' must "
844 "be greater than 0.\n");
845 ERROR ("rrdtool: `CacheTimeout' must "
846 "be greater than 0.\n");
851 else if (strcasecmp ("CacheFlush", key) == 0)
853 int tmp = atoi (value);
856 fprintf (stderr, "rrdtool: `CacheFlush' must "
857 "be greater than 0.\n");
858 ERROR ("rrdtool: `CacheFlush' must "
859 "be greater than 0.\n");
862 cache_flush_timeout = tmp;
864 else if (strcasecmp ("DataDir", key) == 0)
868 datadir = strdup (value);
871 int len = strlen (datadir);
872 while ((len > 0) && (datadir[len - 1] == '/'))
884 else if (strcasecmp ("StepSize", key) == 0)
886 int temp = atoi (value);
888 rrdcreate_config.stepsize = temp;
890 else if (strcasecmp ("HeartBeat", key) == 0)
892 int temp = atoi (value);
894 rrdcreate_config.heartbeat = temp;
896 else if (strcasecmp ("RRARows", key) == 0)
898 int tmp = atoi (value);
901 fprintf (stderr, "rrdtool: `RRARows' must "
902 "be greater than 0.\n");
903 ERROR ("rrdtool: `RRARows' must "
904 "be greater than 0.\n");
907 rrdcreate_config.rrarows = tmp;
909 else if (strcasecmp ("RRATimespan", key) == 0)
911 char *saveptr = NULL;
917 value_copy = strdup (value);
918 if (value_copy == NULL)
922 while ((ptr = strtok_r (dummy, ", \t", &saveptr)) != NULL)
926 tmp_alloc = realloc (rrdcreate_config.timespans,
927 sizeof (int) * (rrdcreate_config.timespans_num + 1));
928 if (tmp_alloc == NULL)
930 fprintf (stderr, "rrdtool: realloc failed.\n");
931 ERROR ("rrdtool: realloc failed.\n");
935 rrdcreate_config.timespans = tmp_alloc;
936 rrdcreate_config.timespans[rrdcreate_config.timespans_num] = atoi (ptr);
937 if (rrdcreate_config.timespans[rrdcreate_config.timespans_num] != 0)
938 rrdcreate_config.timespans_num++;
939 } /* while (strtok_r) */
941 qsort (/* base = */ rrdcreate_config.timespans,
942 /* nmemb = */ rrdcreate_config.timespans_num,
943 /* size = */ sizeof (rrdcreate_config.timespans[0]),
944 /* compar = */ rrd_compare_numeric);
948 else if (strcasecmp ("XFF", key) == 0)
950 double tmp = atof (value);
951 if ((tmp < 0.0) || (tmp >= 1.0))
953 fprintf (stderr, "rrdtool: `XFF' must "
954 "be in the range 0 to 1 (exclusive).");
955 ERROR ("rrdtool: `XFF' must "
956 "be in the range 0 to 1 (exclusive).");
959 rrdcreate_config.xff = tmp;
961 else if (strcasecmp ("WritesPerSecond", key) == 0)
963 double wps = atof (value);
967 fprintf (stderr, "rrdtool: `WritesPerSecond' must be "
968 "greater than or equal to zero.");
977 write_rate = 1.0 / wps;
985 } /* int rrd_config */
987 static int rrd_shutdown (void)
989 pthread_mutex_lock (&cache_lock);
990 rrd_cache_flush (-1);
991 pthread_mutex_unlock (&cache_lock);
993 pthread_mutex_lock (&queue_lock);
995 pthread_cond_signal (&queue_cond);
996 pthread_mutex_unlock (&queue_lock);
998 if ((queue_thread_running != 0)
999 && ((queue_head != NULL) || (flushq_head != NULL)))
1001 INFO ("rrdtool plugin: Shutting down the queue thread. "
1002 "This may take a while.");
1004 else if (queue_thread_running != 0)
1006 INFO ("rrdtool plugin: Shutting down the queue thread.");
1009 /* Wait for all the values to be written to disk before returning. */
1010 if (queue_thread_running != 0)
1012 pthread_join (queue_thread, NULL);
1013 memset (&queue_thread, 0, sizeof (queue_thread));
1014 queue_thread_running = 0;
1015 DEBUG ("rrdtool plugin: queue_thread exited.");
1018 /* TODO: Maybe it'd be a good idea to free the cache here.. */
1021 } /* int rrd_shutdown */
1023 static int rrd_init (void)
1027 if (rrdcreate_config.stepsize < 0)
1028 rrdcreate_config.stepsize = 0;
1029 if (rrdcreate_config.heartbeat <= 0)
1030 rrdcreate_config.heartbeat = 2 * rrdcreate_config.stepsize;
1032 if ((rrdcreate_config.heartbeat > 0)
1033 && (rrdcreate_config.heartbeat < interval_g))
1034 WARNING ("rrdtool plugin: Your `heartbeat' is "
1035 "smaller than your `interval'. This will "
1036 "likely cause problems.");
1037 else if ((rrdcreate_config.stepsize > 0)
1038 && (rrdcreate_config.stepsize < interval_g))
1039 WARNING ("rrdtool plugin: Your `stepsize' is "
1040 "smaller than your `interval'. This will "
1041 "create needlessly big RRD-files.");
1043 /* Set the cache up */
1044 pthread_mutex_lock (&cache_lock);
1046 cache = c_avl_create ((int (*) (const void *, const void *)) strcmp);
1049 ERROR ("rrdtool plugin: c_avl_create failed.");
1053 cache_flush_last = time (NULL);
1054 if (cache_timeout < 2)
1057 cache_flush_timeout = 0;
1059 else if (cache_flush_timeout < cache_timeout)
1060 cache_flush_timeout = 10 * cache_timeout;
1062 pthread_mutex_unlock (&cache_lock);
1064 status = pthread_create (&queue_thread, /* attr = */ NULL,
1065 rrd_queue_thread, /* args = */ NULL);
1068 ERROR ("rrdtool plugin: Cannot create queue-thread.");
1071 queue_thread_running = 1;
1073 DEBUG ("rrdtool plugin: rrd_init: datadir = %s; stepsize = %i;"
1074 " heartbeat = %i; rrarows = %i; xff = %lf;",
1075 (datadir == NULL) ? "(null)" : datadir,
1076 rrdcreate_config.stepsize,
1077 rrdcreate_config.heartbeat,
1078 rrdcreate_config.rrarows,
1079 rrdcreate_config.xff);
1082 } /* int rrd_init */
1084 void module_register (void)
1086 plugin_register_config ("rrdtool", rrd_config,
1087 config_keys, config_keys_num);
1088 plugin_register_init ("rrdtool", rrd_init);
1089 plugin_register_write ("rrdtool", rrd_write, /* user_data = */ NULL);
1090 plugin_register_flush ("rrdtool", rrd_flush, /* user_data = */ NULL);
1091 plugin_register_shutdown ("rrdtool", rrd_shutdown);