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;
289 pthread_mutex_lock (&queue_lock);
290 /* Wait for values to arrive */
293 struct timespec ts_wait;
295 while ((flushq_head == NULL) && (queue_head == NULL)
296 && (do_shutdown == 0))
297 pthread_cond_wait (&queue_cond, &queue_lock);
299 if ((flushq_head == NULL) && (queue_head == NULL))
302 /* Don't delay if there's something to flush */
303 if (flushq_head != NULL)
306 /* Don't delay if we're shutting down */
307 if (do_shutdown != 0)
310 /* Don't delay if no delay was configured. */
311 if (write_rate <= 0.0)
314 gettimeofday (&tv_now, /* timezone = */ NULL);
315 status = timeval_cmp (tv_next_update, tv_now, NULL);
316 /* We're good to go */
320 /* We're supposed to wait a bit with this update, so we'll
321 * wait for the next addition to the queue or to the end of
322 * the wait period - whichever comes first. */
323 ts_wait.tv_sec = tv_next_update.tv_sec;
324 ts_wait.tv_nsec = 1000 * tv_next_update.tv_usec;
326 status = pthread_cond_timedwait (&queue_cond, &queue_lock,
328 if (status == ETIMEDOUT)
332 /* XXX: If you need to lock both, cache_lock and queue_lock, at
333 * the same time, ALWAYS lock `cache_lock' first! */
335 /* We're in the shutdown phase */
336 if ((flushq_head == NULL) && (queue_head == NULL))
338 pthread_mutex_unlock (&queue_lock);
342 if (flushq_head != NULL)
344 /* Dequeue the first flush entry */
345 queue_entry = flushq_head;
346 if (flushq_head == flushq_tail)
347 flushq_head = flushq_tail = NULL;
349 flushq_head = flushq_head->next;
351 else /* if (queue_head != NULL) */
353 /* Dequeue the first regular entry */
354 queue_entry = queue_head;
355 if (queue_head == queue_tail)
356 queue_head = queue_tail = NULL;
358 queue_head = queue_head->next;
361 /* Unlock the queue again */
362 pthread_mutex_unlock (&queue_lock);
364 /* We now need the cache lock so the entry isn't updated while
365 * we make a copy of it's values */
366 pthread_mutex_lock (&cache_lock);
368 status = c_avl_get (cache, queue_entry->filename,
369 (void *) &cache_entry);
373 values = cache_entry->values;
374 values_num = cache_entry->values_num;
376 cache_entry->values = NULL;
377 cache_entry->values_num = 0;
378 cache_entry->flags = FLAG_NONE;
381 pthread_mutex_unlock (&cache_lock);
385 sfree (queue_entry->filename);
390 /* Update `tv_next_update' */
391 if (write_rate > 0.0)
393 gettimeofday (&tv_now, /* timezone = */ NULL);
394 tv_next_update.tv_sec = tv_now.tv_sec;
395 tv_next_update.tv_usec = tv_now.tv_usec
396 + ((suseconds_t) (1000000 * write_rate));
397 while (tv_next_update.tv_usec > 1000000)
399 tv_next_update.tv_sec++;
400 tv_next_update.tv_usec -= 1000000;
404 /* Write the values to the RRD-file */
405 srrd_update (queue_entry->filename, NULL,
406 values_num, (const char **)values);
407 DEBUG ("rrdtool plugin: queue thread: Wrote %i value%s to %s",
408 values_num, (values_num == 1) ? "" : "s",
409 queue_entry->filename);
411 for (i = 0; i < values_num; i++)
416 sfree (queue_entry->filename);
420 pthread_mutex_lock (&cache_lock);
421 c_avl_destroy (cache);
423 pthread_mutex_unlock (&cache_lock);
425 pthread_exit ((void *) 0);
427 } /* void *rrd_queue_thread */
429 static int rrd_queue_enqueue (const char *filename,
430 rrd_queue_t **head, rrd_queue_t **tail)
432 rrd_queue_t *queue_entry;
434 queue_entry = (rrd_queue_t *) malloc (sizeof (rrd_queue_t));
435 if (queue_entry == NULL)
438 queue_entry->filename = strdup (filename);
439 if (queue_entry->filename == NULL)
445 queue_entry->next = NULL;
447 pthread_mutex_lock (&queue_lock);
452 (*tail)->next = queue_entry;
455 pthread_cond_signal (&queue_cond);
456 pthread_mutex_unlock (&queue_lock);
459 } /* int rrd_queue_enqueue */
461 static int rrd_queue_dequeue (const char *filename,
462 rrd_queue_t **head, rrd_queue_t **tail)
467 pthread_mutex_lock (&queue_lock);
474 if (strcmp (this->filename, filename) == 0)
483 pthread_mutex_unlock (&queue_lock);
490 prev->next = this->next;
492 if (this->next == NULL)
495 pthread_mutex_unlock (&queue_lock);
497 sfree (this->filename);
501 } /* int rrd_queue_dequeue */
503 static void rrd_cache_flush (int timeout)
512 c_avl_iterator_t *iter;
515 DEBUG ("rrdtool plugin: Flushing cache, timeout = %i", timeout);
519 /* Build a list of entries to be flushed */
520 iter = c_avl_get_iterator (cache);
521 while (c_avl_iterator_next (iter, (void *) &key, (void *) &rc) == 0)
523 if (rc->flags != FLAG_NONE)
525 else if ((now - rc->first_value) < timeout)
527 else if (rc->values_num > 0)
531 status = rrd_queue_enqueue (key, &queue_head, &queue_tail);
533 rc->flags = FLAG_QUEUED;
535 else /* ancient and no values -> waste of memory */
537 char **tmp = (char **) realloc ((void *) keys,
538 (keys_num + 1) * sizeof (char *));
542 ERROR ("rrdtool plugin: "
543 "realloc failed: %s",
544 sstrerror (errno, errbuf,
546 c_avl_iterator_destroy (iter);
551 keys[keys_num] = key;
554 } /* while (c_avl_iterator_next) */
555 c_avl_iterator_destroy (iter);
557 for (i = 0; i < keys_num; i++)
559 if (c_avl_remove (cache, keys[i], (void *) &key, (void *) &rc) != 0)
561 DEBUG ("rrdtool plugin: c_avl_remove (%s) failed.", keys[i]);
565 assert (rc->values == NULL);
566 assert (rc->values_num == 0);
571 } /* for (i = 0..keys_num) */
575 cache_flush_last = now;
576 } /* void rrd_cache_flush */
578 static int rrd_cache_flush_identifier (int timeout, const char *identifier)
585 if (identifier == NULL)
587 rrd_cache_flush (timeout);
594 snprintf (key, sizeof (key), "%s.rrd",
597 snprintf (key, sizeof (key), "%s/%s.rrd",
598 datadir, identifier);
599 key[sizeof (key) - 1] = 0;
601 status = c_avl_get (cache, key, (void *) &rc);
604 WARNING ("rrdtool plugin: rrd_cache_flush_identifier: "
605 "c_avl_get (%s) failed. Does that file really exist?",
610 if (rc->flags == FLAG_FLUSHQ)
614 else if (rc->flags == FLAG_QUEUED)
616 rrd_queue_dequeue (key, &queue_head, &queue_tail);
617 status = rrd_queue_enqueue (key, &flushq_head, &flushq_tail);
619 rc->flags = FLAG_FLUSHQ;
621 else if ((now - rc->first_value) < timeout)
625 else if (rc->values_num > 0)
627 status = rrd_queue_enqueue (key, &flushq_head, &flushq_tail);
629 rc->flags = FLAG_FLUSHQ;
633 } /* int rrd_cache_flush_identifier */
635 static int rrd_cache_insert (const char *filename,
636 const char *value, time_t value_time)
638 rrd_cache_t *rc = NULL;
642 pthread_mutex_lock (&cache_lock);
644 /* This shouldn't happen, but it did happen at least once, so we'll be
648 pthread_mutex_unlock (&cache_lock);
649 WARNING ("rrdtool plugin: cache == NULL.");
653 c_avl_get (cache, filename, (void *) &rc);
657 rc = (rrd_cache_t *) malloc (sizeof (rrd_cache_t));
664 rc->flags = FLAG_NONE;
668 if (rc->last_value >= value_time)
670 pthread_mutex_unlock (&cache_lock);
671 WARNING ("rrdtool plugin: (rc->last_value = %u) >= (value_time = %u)",
672 (unsigned int) rc->last_value,
673 (unsigned int) value_time);
677 values_new = (char **) realloc ((void *) rc->values,
678 (rc->values_num + 1) * sizeof (char *));
679 if (values_new == NULL)
682 void *cache_key = NULL;
684 sstrerror (errno, errbuf, sizeof (errbuf));
686 c_avl_remove (cache, filename, &cache_key, NULL);
687 pthread_mutex_unlock (&cache_lock);
689 ERROR ("rrdtool plugin: realloc failed: %s", errbuf);
696 rc->values = values_new;
698 rc->values[rc->values_num] = strdup (value);
699 if (rc->values[rc->values_num] != NULL)
702 if (rc->values_num == 1)
703 rc->first_value = value_time;
704 rc->last_value = value_time;
706 /* Insert if this is the first value */
709 void *cache_key = strdup (filename);
711 if (cache_key == NULL)
714 sstrerror (errno, errbuf, sizeof (errbuf));
716 pthread_mutex_unlock (&cache_lock);
718 ERROR ("rrdtool plugin: strdup failed: %s", errbuf);
720 sfree (rc->values[0]);
726 c_avl_insert (cache, cache_key, rc);
729 DEBUG ("rrdtool plugin: rrd_cache_insert: file = %s; "
730 "values_num = %i; age = %lu;",
731 filename, rc->values_num,
732 (unsigned long)(rc->last_value - rc->first_value));
734 if ((rc->last_value - rc->first_value) >= cache_timeout)
736 /* XXX: If you need to lock both, cache_lock and queue_lock, at
737 * the same time, ALWAYS lock `cache_lock' first! */
738 if (rc->flags == FLAG_NONE)
742 status = rrd_queue_enqueue (filename, &queue_head, &queue_tail);
744 rc->flags = FLAG_QUEUED;
748 DEBUG ("rrdtool plugin: `%s' is already queued.", filename);
752 if ((cache_timeout > 0) &&
753 ((time (NULL) - cache_flush_last) > cache_flush_timeout))
754 rrd_cache_flush (cache_flush_timeout);
756 pthread_mutex_unlock (&cache_lock);
759 } /* int rrd_cache_insert */
761 static int rrd_compare_numeric (const void *a_ptr, const void *b_ptr)
763 int a = *((int *) a_ptr);
764 int b = *((int *) b_ptr);
772 } /* int rrd_compare_numeric */
774 static int rrd_write (const data_set_t *ds, const value_list_t *vl,
775 user_data_t __attribute__((unused)) *user_data)
782 if (0 != strcmp (ds->type, vl->type)) {
783 ERROR ("rrdtool plugin: DS type does not match value list type");
787 if (value_list_to_filename (filename, sizeof (filename), ds, vl) != 0)
790 if (value_list_to_string (values, sizeof (values), ds, vl) != 0)
793 if (stat (filename, &statbuf) == -1)
797 status = cu_rrd_create_file (filename,
798 ds, vl, &rrdcreate_config);
805 ERROR ("stat(%s) failed: %s", filename,
806 sstrerror (errno, errbuf,
811 else if (!S_ISREG (statbuf.st_mode))
813 ERROR ("stat(%s): Not a regular file!",
818 status = rrd_cache_insert (filename, values, vl->time);
821 } /* int rrd_write */
823 static int rrd_flush (int timeout, const char *identifier,
824 user_data_t __attribute__((unused)) *user_data)
826 pthread_mutex_lock (&cache_lock);
829 pthread_mutex_unlock (&cache_lock);
833 rrd_cache_flush_identifier (timeout, identifier);
835 pthread_mutex_unlock (&cache_lock);
837 } /* int rrd_flush */
839 static int rrd_config (const char *key, const char *value)
841 if (strcasecmp ("CacheTimeout", key) == 0)
843 int tmp = atoi (value);
846 fprintf (stderr, "rrdtool: `CacheTimeout' must "
847 "be greater than 0.\n");
848 ERROR ("rrdtool: `CacheTimeout' must "
849 "be greater than 0.\n");
854 else if (strcasecmp ("CacheFlush", key) == 0)
856 int tmp = atoi (value);
859 fprintf (stderr, "rrdtool: `CacheFlush' must "
860 "be greater than 0.\n");
861 ERROR ("rrdtool: `CacheFlush' must "
862 "be greater than 0.\n");
865 cache_flush_timeout = tmp;
867 else if (strcasecmp ("DataDir", key) == 0)
871 datadir = strdup (value);
874 int len = strlen (datadir);
875 while ((len > 0) && (datadir[len - 1] == '/'))
887 else if (strcasecmp ("StepSize", key) == 0)
889 int temp = atoi (value);
891 rrdcreate_config.stepsize = temp;
893 else if (strcasecmp ("HeartBeat", key) == 0)
895 int temp = atoi (value);
897 rrdcreate_config.heartbeat = temp;
899 else if (strcasecmp ("RRARows", key) == 0)
901 int tmp = atoi (value);
904 fprintf (stderr, "rrdtool: `RRARows' must "
905 "be greater than 0.\n");
906 ERROR ("rrdtool: `RRARows' must "
907 "be greater than 0.\n");
910 rrdcreate_config.rrarows = tmp;
912 else if (strcasecmp ("RRATimespan", key) == 0)
914 char *saveptr = NULL;
920 value_copy = strdup (value);
921 if (value_copy == NULL)
925 while ((ptr = strtok_r (dummy, ", \t", &saveptr)) != NULL)
929 tmp_alloc = realloc (rrdcreate_config.timespans,
930 sizeof (int) * (rrdcreate_config.timespans_num + 1));
931 if (tmp_alloc == NULL)
933 fprintf (stderr, "rrdtool: realloc failed.\n");
934 ERROR ("rrdtool: realloc failed.\n");
938 rrdcreate_config.timespans = tmp_alloc;
939 rrdcreate_config.timespans[rrdcreate_config.timespans_num] = atoi (ptr);
940 if (rrdcreate_config.timespans[rrdcreate_config.timespans_num] != 0)
941 rrdcreate_config.timespans_num++;
942 } /* while (strtok_r) */
944 qsort (/* base = */ rrdcreate_config.timespans,
945 /* nmemb = */ rrdcreate_config.timespans_num,
946 /* size = */ sizeof (rrdcreate_config.timespans[0]),
947 /* compar = */ rrd_compare_numeric);
951 else if (strcasecmp ("XFF", key) == 0)
953 double tmp = atof (value);
954 if ((tmp < 0.0) || (tmp >= 1.0))
956 fprintf (stderr, "rrdtool: `XFF' must "
957 "be in the range 0 to 1 (exclusive).");
958 ERROR ("rrdtool: `XFF' must "
959 "be in the range 0 to 1 (exclusive).");
962 rrdcreate_config.xff = tmp;
964 else if (strcasecmp ("WritesPerSecond", key) == 0)
966 double wps = atof (value);
970 fprintf (stderr, "rrdtool: `WritesPerSecond' must be "
971 "greater than or equal to zero.");
980 write_rate = 1.0 / wps;
988 } /* int rrd_config */
990 static int rrd_shutdown (void)
992 pthread_mutex_lock (&cache_lock);
993 rrd_cache_flush (-1);
994 pthread_mutex_unlock (&cache_lock);
996 pthread_mutex_lock (&queue_lock);
998 pthread_cond_signal (&queue_cond);
999 pthread_mutex_unlock (&queue_lock);
1001 if ((queue_thread_running != 0)
1002 && ((queue_head != NULL) || (flushq_head != NULL)))
1004 INFO ("rrdtool plugin: Shutting down the queue thread. "
1005 "This may take a while.");
1007 else if (queue_thread_running != 0)
1009 INFO ("rrdtool plugin: Shutting down the queue thread.");
1012 /* Wait for all the values to be written to disk before returning. */
1013 if (queue_thread_running != 0)
1015 pthread_join (queue_thread, NULL);
1016 memset (&queue_thread, 0, sizeof (queue_thread));
1017 queue_thread_running = 0;
1018 DEBUG ("rrdtool plugin: queue_thread exited.");
1021 /* TODO: Maybe it'd be a good idea to free the cache here.. */
1024 } /* int rrd_shutdown */
1026 static int rrd_init (void)
1028 static int init_once = 0;
1035 if (rrdcreate_config.stepsize < 0)
1036 rrdcreate_config.stepsize = 0;
1037 if (rrdcreate_config.heartbeat <= 0)
1038 rrdcreate_config.heartbeat = 2 * rrdcreate_config.stepsize;
1040 if ((rrdcreate_config.heartbeat > 0)
1041 && (rrdcreate_config.heartbeat < interval_g))
1042 WARNING ("rrdtool plugin: Your `heartbeat' is "
1043 "smaller than your `interval'. This will "
1044 "likely cause problems.");
1045 else if ((rrdcreate_config.stepsize > 0)
1046 && (rrdcreate_config.stepsize < interval_g))
1047 WARNING ("rrdtool plugin: Your `stepsize' is "
1048 "smaller than your `interval'. This will "
1049 "create needlessly big RRD-files.");
1051 /* Set the cache up */
1052 pthread_mutex_lock (&cache_lock);
1054 cache = c_avl_create ((int (*) (const void *, const void *)) strcmp);
1057 ERROR ("rrdtool plugin: c_avl_create failed.");
1061 cache_flush_last = time (NULL);
1062 if (cache_timeout < 2)
1065 cache_flush_timeout = 0;
1067 else if (cache_flush_timeout < cache_timeout)
1068 cache_flush_timeout = 10 * cache_timeout;
1070 pthread_mutex_unlock (&cache_lock);
1072 status = pthread_create (&queue_thread, /* attr = */ NULL,
1073 rrd_queue_thread, /* args = */ NULL);
1076 ERROR ("rrdtool plugin: Cannot create queue-thread.");
1079 queue_thread_running = 1;
1081 DEBUG ("rrdtool plugin: rrd_init: datadir = %s; stepsize = %i;"
1082 " heartbeat = %i; rrarows = %i; xff = %lf;",
1083 (datadir == NULL) ? "(null)" : datadir,
1084 rrdcreate_config.stepsize,
1085 rrdcreate_config.heartbeat,
1086 rrdcreate_config.rrarows,
1087 rrdcreate_config.xff);
1090 } /* int rrd_init */
1092 void module_register (void)
1094 plugin_register_config ("rrdtool", rrd_config,
1095 config_keys, config_keys_num);
1096 plugin_register_init ("rrdtool", rrd_init);
1097 plugin_register_write ("rrdtool", rrd_write, /* user_data = */ NULL);
1098 plugin_register_flush ("rrdtool", rrd_flush, /* user_data = */ NULL);
1099 plugin_register_shutdown ("rrdtool", rrd_shutdown);