1 /**
2 * collectd - src/plugin.c
3 * Copyright (C) 2005-2014 Florian octo Forster
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
22 *
23 * Authors:
24 * Florian octo Forster <octo at collectd.org>
25 * Sebastian Harl <sh at tokkee.org>
26 **/
28 #include "collectd.h"
29 #include "common.h"
30 #include "plugin.h"
31 #include "configfile.h"
32 #include "filter_chain.h"
33 #include "utils_avltree.h"
34 #include "utils_cache.h"
35 #include "utils_complain.h"
36 #include "utils_llist.h"
37 #include "utils_heap.h"
38 #include "utils_time.h"
39 #include "utils_random.h"
41 #include <ltdl.h>
43 /*
44 * Private structures
45 */
46 struct callback_func_s
47 {
48 void *cf_callback;
49 user_data_t cf_udata;
50 plugin_ctx_t cf_ctx;
51 };
52 typedef struct callback_func_s callback_func_t;
54 #define RF_SIMPLE 0
55 #define RF_COMPLEX 1
56 #define RF_REMOVE 65535
57 struct read_func_s
58 {
59 /* `read_func_t' "inherits" from `callback_func_t'.
60 * The `rf_super' member MUST be the first one in this structure! */
61 #define rf_callback rf_super.cf_callback
62 #define rf_udata rf_super.cf_udata
63 #define rf_ctx rf_super.cf_ctx
64 callback_func_t rf_super;
65 char rf_group[DATA_MAX_NAME_LEN];
66 char *rf_name;
67 int rf_type;
68 cdtime_t rf_interval;
69 cdtime_t rf_effective_interval;
70 cdtime_t rf_next_read;
71 };
72 typedef struct read_func_s read_func_t;
74 struct write_queue_s;
75 typedef struct write_queue_s write_queue_t;
76 struct write_queue_s
77 {
78 value_list_t *vl;
79 plugin_ctx_t ctx;
80 write_queue_t *next;
81 };
83 /*
84 * Private variables
85 */
86 static c_avl_tree_t *plugins_loaded = NULL;
88 static llist_t *list_init;
89 static llist_t *list_write;
90 static llist_t *list_flush;
91 static llist_t *list_missing;
92 static llist_t *list_shutdown;
93 static llist_t *list_log;
94 static llist_t *list_notification;
96 static fc_chain_t *pre_cache_chain = NULL;
97 static fc_chain_t *post_cache_chain = NULL;
99 static c_avl_tree_t *data_sets;
101 static char *plugindir = NULL;
103 #ifndef DEFAULT_MAX_READ_INTERVAL
104 # define DEFAULT_MAX_READ_INTERVAL TIME_T_TO_CDTIME_T (86400)
105 #endif
106 static c_heap_t *read_heap = NULL;
107 static llist_t *read_list;
108 static int read_loop = 1;
109 static pthread_mutex_t read_lock = PTHREAD_MUTEX_INITIALIZER;
110 static pthread_cond_t read_cond = PTHREAD_COND_INITIALIZER;
111 static pthread_t *read_threads = NULL;
112 static int read_threads_num = 0;
113 static cdtime_t max_read_interval = DEFAULT_MAX_READ_INTERVAL;
115 static write_queue_t *write_queue_head;
116 static write_queue_t *write_queue_tail;
117 static long write_queue_length = 0;
118 static _Bool write_loop = 1;
119 static pthread_mutex_t write_lock = PTHREAD_MUTEX_INITIALIZER;
120 static pthread_cond_t write_cond = PTHREAD_COND_INITIALIZER;
121 static pthread_t *write_threads = NULL;
122 static size_t write_threads_num = 0;
124 static pthread_key_t plugin_ctx_key;
125 static _Bool plugin_ctx_key_initialized = 0;
127 static long write_limit_high = 0;
128 static long write_limit_low = 0;
130 static derive_t stats_values_dropped = 0;
131 static _Bool record_statistics = 0;
133 /*
134 * Static functions
135 */
136 static int plugin_dispatch_values_internal (value_list_t *vl);
138 static const char *plugin_get_dir (void)
139 {
140 if (plugindir == NULL)
141 return (PLUGINDIR);
142 else
143 return (plugindir);
144 }
146 static void plugin_update_internal_statistics (void) { /* {{{ */
147 derive_t copy_write_queue_length;
148 value_list_t vl = VALUE_LIST_INIT;
149 value_t values[2];
151 copy_write_queue_length = write_queue_length;
153 /* Initialize `vl' */
154 vl.values = values;
155 vl.values_len = 2;
156 vl.time = 0;
157 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
158 sstrncpy (vl.plugin, "collectd", sizeof (vl.plugin));
160 vl.type_instance[0] = 0;
161 vl.values_len = 1;
163 /* Write queue */
164 sstrncpy (vl.plugin_instance, "write_queue",
165 sizeof (vl.plugin_instance));
167 /* Write queue : queue length */
168 vl.values[0].gauge = (gauge_t) copy_write_queue_length;
169 sstrncpy (vl.type, "queue_length", sizeof (vl.type));
170 vl.type_instance[0] = 0;
171 plugin_dispatch_values (&vl);
173 /* Write queue : Values dropped (queue length > low limit) */
174 vl.values[0].derive = (derive_t) stats_values_dropped;
175 sstrncpy (vl.type, "derive", sizeof (vl.type));
176 sstrncpy (vl.type_instance, "dropped", sizeof (vl.type_instance));
177 plugin_dispatch_values (&vl);
179 /* Cache */
180 sstrncpy (vl.plugin_instance, "cache",
181 sizeof (vl.plugin_instance));
183 /* Cache : Nb entry in cache tree */
184 vl.values[0].gauge = (gauge_t) uc_get_size();
185 sstrncpy (vl.type, "cache_size", sizeof (vl.type));
186 vl.type_instance[0] = 0;
187 plugin_dispatch_values (&vl);
189 return;
190 } /* }}} void plugin_update_internal_statistics */
192 static void destroy_callback (callback_func_t *cf) /* {{{ */
193 {
194 if (cf == NULL)
195 return;
197 if ((cf->cf_udata.data != NULL) && (cf->cf_udata.free_func != NULL))
198 {
199 cf->cf_udata.free_func (cf->cf_udata.data);
200 cf->cf_udata.data = NULL;
201 cf->cf_udata.free_func = NULL;
202 }
203 sfree (cf);
204 } /* }}} void destroy_callback */
206 static void destroy_all_callbacks (llist_t **list) /* {{{ */
207 {
208 llentry_t *le;
210 if (*list == NULL)
211 return;
213 le = llist_head (*list);
214 while (le != NULL)
215 {
216 llentry_t *le_next;
218 le_next = le->next;
220 sfree (le->key);
221 destroy_callback (le->value);
222 le->value = NULL;
224 le = le_next;
225 }
227 llist_destroy (*list);
228 *list = NULL;
229 } /* }}} void destroy_all_callbacks */
231 static void destroy_read_heap (void) /* {{{ */
232 {
233 if (read_heap == NULL)
234 return;
236 while (42)
237 {
238 read_func_t *rf;
240 rf = c_heap_get_root (read_heap);
241 if (rf == NULL)
242 break;
243 sfree (rf->rf_name);
244 destroy_callback ((callback_func_t *) rf);
245 }
247 c_heap_destroy (read_heap);
248 read_heap = NULL;
249 } /* }}} void destroy_read_heap */
251 static int register_callback (llist_t **list, /* {{{ */
252 const char *name, callback_func_t *cf)
253 {
254 llentry_t *le;
255 char *key;
257 if (*list == NULL)
258 {
259 *list = llist_create ();
260 if (*list == NULL)
261 {
262 ERROR ("plugin: register_callback: "
263 "llist_create failed.");
264 destroy_callback (cf);
265 return (-1);
266 }
267 }
269 key = strdup (name);
270 if (key == NULL)
271 {
272 ERROR ("plugin: register_callback: strdup failed.");
273 destroy_callback (cf);
274 return (-1);
275 }
277 le = llist_search (*list, name);
278 if (le == NULL)
279 {
280 le = llentry_create (key, cf);
281 if (le == NULL)
282 {
283 ERROR ("plugin: register_callback: "
284 "llentry_create failed.");
285 free (key);
286 destroy_callback (cf);
287 return (-1);
288 }
290 llist_append (*list, le);
291 }
292 else
293 {
294 callback_func_t *old_cf;
296 old_cf = le->value;
297 le->value = cf;
299 WARNING ("plugin: register_callback: "
300 "a callback named `%s' already exists - "
301 "overwriting the old entry!", name);
303 destroy_callback (old_cf);
304 sfree (key);
305 }
307 return (0);
308 } /* }}} int register_callback */
310 static void log_list_callbacks (llist_t **list, /* {{{ */
311 const char *comment)
312 {
313 char *str;
314 int len;
315 llentry_t *le;
316 int i;
317 int n;
318 char **keys;
320 n = llist_size(*list);
321 if (n == 0)
322 {
323 INFO("%s [none]", comment);
324 return;
325 }
327 keys = calloc(n, sizeof(char*));
329 if (keys == NULL)
330 {
331 ERROR("%s: failed to allocate memory for list of callbacks",
332 comment);
334 return;
335 }
337 for (le = llist_head (*list), i = 0, len = 0;
338 le != NULL;
339 le = le->next, i++)
340 {
341 keys[i] = le->key;
342 len += strlen(le->key) + 6;
343 }
344 str = malloc(len + 10);
345 if (str == NULL)
346 {
347 ERROR("%s: failed to allocate memory for list of callbacks",
348 comment);
349 }
350 else
351 {
352 *str = '\0';
353 strjoin(str, len, keys, n, "', '");
354 INFO("%s ['%s']", comment, str);
355 free(str);
356 }
357 free(keys);
358 } /* }}} void log_list_callbacks */
360 static int create_register_callback (llist_t **list, /* {{{ */
361 const char *name, void *callback, user_data_t *ud)
362 {
363 callback_func_t *cf;
365 cf = (callback_func_t *) malloc (sizeof (*cf));
366 if (cf == NULL)
367 {
368 ERROR ("plugin: create_register_callback: malloc failed.");
369 return (-1);
370 }
371 memset (cf, 0, sizeof (*cf));
373 cf->cf_callback = callback;
374 if (ud == NULL)
375 {
376 cf->cf_udata.data = NULL;
377 cf->cf_udata.free_func = NULL;
378 }
379 else
380 {
381 cf->cf_udata = *ud;
382 }
384 cf->cf_ctx = plugin_get_ctx ();
386 return (register_callback (list, name, cf));
387 } /* }}} int create_register_callback */
389 static int plugin_unregister (llist_t *list, const char *name) /* {{{ */
390 {
391 llentry_t *e;
393 if (list == NULL)
394 return (-1);
396 e = llist_search (list, name);
397 if (e == NULL)
398 return (-1);
400 llist_remove (list, e);
402 sfree (e->key);
403 destroy_callback (e->value);
405 llentry_destroy (e);
407 return (0);
408 } /* }}} int plugin_unregister */
410 /*
411 * (Try to) load the shared object `file'. Won't complain if it isn't a shared
412 * object, but it will bitch about a shared object not having a
413 * ``module_register'' symbol..
414 */
415 static int plugin_load_file (char *file, uint32_t flags)
416 {
417 lt_dlhandle dlh;
418 void (*reg_handle) (void);
420 lt_dlinit ();
421 lt_dlerror (); /* clear errors */
423 #if LIBTOOL_VERSION == 2
424 if (flags & PLUGIN_FLAGS_GLOBAL) {
425 lt_dladvise advise;
426 lt_dladvise_init(&advise);
427 lt_dladvise_global(&advise);
428 dlh = lt_dlopenadvise(file, advise);
429 lt_dladvise_destroy(&advise);
430 } else {
431 dlh = lt_dlopen (file);
432 }
433 #else /* if LIBTOOL_VERSION == 1 */
434 if (flags & PLUGIN_FLAGS_GLOBAL)
435 WARNING ("plugin_load_file: The global flag is not supported, "
436 "libtool 2 is required for this.");
437 dlh = lt_dlopen (file);
438 #endif
440 if (dlh == NULL)
441 {
442 char errbuf[1024] = "";
444 ssnprintf (errbuf, sizeof (errbuf),
445 "lt_dlopen (\"%s\") failed: %s. "
446 "The most common cause for this problem is "
447 "missing dependencies. Use ldd(1) to check "
448 "the dependencies of the plugin "
449 "/ shared object.",
450 file, lt_dlerror ());
452 ERROR ("%s", errbuf);
453 /* Make sure this is printed to STDERR in any case, but also
454 * make sure it's printed only once. */
455 if (list_log != NULL)
456 fprintf (stderr, "ERROR: %s\n", errbuf);
458 return (1);
459 }
461 if ((reg_handle = (void (*) (void)) lt_dlsym (dlh, "module_register")) == NULL)
462 {
463 WARNING ("Couldn't find symbol \"module_register\" in \"%s\": %s\n",
464 file, lt_dlerror ());
465 lt_dlclose (dlh);
466 return (-1);
467 }
469 (*reg_handle) ();
471 return (0);
472 }
474 static void *plugin_read_thread (void __attribute__((unused)) *args)
475 {
476 while (read_loop != 0)
477 {
478 read_func_t *rf;
479 plugin_ctx_t old_ctx;
480 cdtime_t now;
481 int status;
482 int rf_type;
483 int rc;
485 /* Get the read function that needs to be read next.
486 * We don't need to hold "read_lock" for the heap, but we need
487 * to call c_heap_get_root() and pthread_cond_wait() in the
488 * same protected block. */
489 pthread_mutex_lock (&read_lock);
490 rf = c_heap_get_root (read_heap);
491 if (rf == NULL)
492 {
493 pthread_cond_wait (&read_cond, &read_lock);
494 pthread_mutex_unlock (&read_lock);
495 continue;
496 }
497 pthread_mutex_unlock (&read_lock);
499 if (rf->rf_interval == 0)
500 {
501 /* this should not happen, because the interval is set
502 * for each plugin when loading it
503 * XXX: issue a warning? */
504 rf->rf_interval = plugin_get_interval ();
505 rf->rf_effective_interval = rf->rf_interval;
507 rf->rf_next_read = cdtime ();
508 }
510 /* sleep until this entry is due,
511 * using pthread_cond_timedwait */
512 pthread_mutex_lock (&read_lock);
513 /* In pthread_cond_timedwait, spurious wakeups are possible
514 * (and really happen, at least on NetBSD with > 1 CPU), thus
515 * we need to re-evaluate the condition every time
516 * pthread_cond_timedwait returns. */
517 rc = 0;
518 while ((read_loop != 0)
519 && (cdtime () < rf->rf_next_read)
520 && rc == 0)
521 {
522 struct timespec ts = { 0 };
524 CDTIME_T_TO_TIMESPEC (rf->rf_next_read, &ts);
526 rc = pthread_cond_timedwait (&read_cond, &read_lock,
527 &ts);
528 }
530 /* Must hold `read_lock' when accessing `rf->rf_type'. */
531 rf_type = rf->rf_type;
532 pthread_mutex_unlock (&read_lock);
534 /* Check if we're supposed to stop.. This may have interrupted
535 * the sleep, too. */
536 if (read_loop == 0)
537 {
538 /* Insert `rf' again, so it can be free'd correctly */
539 c_heap_insert (read_heap, rf);
540 break;
541 }
543 /* The entry has been marked for deletion. The linked list
544 * entry has already been removed by `plugin_unregister_read'.
545 * All we have to do here is free the `read_func_t' and
546 * continue. */
547 if (rf_type == RF_REMOVE)
548 {
549 DEBUG ("plugin_read_thread: Destroying the `%s' "
550 "callback.", rf->rf_name);
551 sfree (rf->rf_name);
552 destroy_callback ((callback_func_t *) rf);
553 rf = NULL;
554 continue;
555 }
557 DEBUG ("plugin_read_thread: Handling `%s'.", rf->rf_name);
559 old_ctx = plugin_set_ctx (rf->rf_ctx);
561 if (rf_type == RF_SIMPLE)
562 {
563 int (*callback) (void);
565 callback = rf->rf_callback;
566 status = (*callback) ();
567 }
568 else
569 {
570 plugin_read_cb callback;
572 assert (rf_type == RF_COMPLEX);
574 callback = rf->rf_callback;
575 status = (*callback) (&rf->rf_udata);
576 }
578 plugin_set_ctx (old_ctx);
580 /* If the function signals failure, we will increase the
581 * intervals in which it will be called. */
582 if (status != 0)
583 {
584 rf->rf_effective_interval *= 2;
585 if (rf->rf_effective_interval > max_read_interval)
586 rf->rf_effective_interval = max_read_interval;
588 NOTICE ("read-function of plugin `%s' failed. "
589 "Will suspend it for %.3f seconds.",
590 rf->rf_name,
591 CDTIME_T_TO_DOUBLE (rf->rf_effective_interval));
592 }
593 else
594 {
595 /* Success: Restore the interval, if it was changed. */
596 rf->rf_effective_interval = rf->rf_interval;
597 }
599 /* update the ``next read due'' field */
600 now = cdtime ();
602 DEBUG ("plugin_read_thread: Effective interval of the "
603 "%s plugin is %.3f seconds.",
604 rf->rf_name,
605 CDTIME_T_TO_DOUBLE (rf->rf_effective_interval));
607 /* Calculate the next (absolute) time at which this function
608 * should be called. */
609 rf->rf_next_read += rf->rf_effective_interval;
611 /* Check, if `rf_next_read' is in the past. */
612 if (rf->rf_next_read < now)
613 {
614 /* `rf_next_read' is in the past. Insert `now'
615 * so this value doesn't trail off into the
616 * past too much. */
617 rf->rf_next_read = now;
618 }
620 DEBUG ("plugin_read_thread: Next read of the %s plugin at %.3f.",
621 rf->rf_name,
622 CDTIME_T_TO_DOUBLE (rf->rf_next_read));
624 /* Re-insert this read function into the heap again. */
625 c_heap_insert (read_heap, rf);
626 } /* while (read_loop) */
628 pthread_exit (NULL);
629 return ((void *) 0);
630 } /* void *plugin_read_thread */
632 static void start_read_threads (int num)
633 {
634 int i;
636 if (read_threads != NULL)
637 return;
639 read_threads = (pthread_t *) calloc (num, sizeof (pthread_t));
640 if (read_threads == NULL)
641 {
642 ERROR ("plugin: start_read_threads: calloc failed.");
643 return;
644 }
646 read_threads_num = 0;
647 for (i = 0; i < num; i++)
648 {
649 if (pthread_create (read_threads + read_threads_num, NULL,
650 plugin_read_thread, NULL) == 0)
651 {
652 read_threads_num++;
653 }
654 else
655 {
656 ERROR ("plugin: start_read_threads: pthread_create failed.");
657 return;
658 }
659 } /* for (i) */
660 } /* void start_read_threads */
662 static void stop_read_threads (void)
663 {
664 int i;
666 if (read_threads == NULL)
667 return;
669 INFO ("collectd: Stopping %i read threads.", read_threads_num);
671 pthread_mutex_lock (&read_lock);
672 read_loop = 0;
673 DEBUG ("plugin: stop_read_threads: Signalling `read_cond'");
674 pthread_cond_broadcast (&read_cond);
675 pthread_mutex_unlock (&read_lock);
677 for (i = 0; i < read_threads_num; i++)
678 {
679 if (pthread_join (read_threads[i], NULL) != 0)
680 {
681 ERROR ("plugin: stop_read_threads: pthread_join failed.");
682 }
683 read_threads[i] = (pthread_t) 0;
684 }
685 sfree (read_threads);
686 read_threads_num = 0;
687 } /* void stop_read_threads */
689 static void plugin_value_list_free (value_list_t *vl) /* {{{ */
690 {
691 if (vl == NULL)
692 return;
694 meta_data_destroy (vl->meta);
695 sfree (vl->values);
696 sfree (vl);
697 } /* }}} void plugin_value_list_free */
699 static value_list_t *plugin_value_list_clone (value_list_t const *vl_orig) /* {{{ */
700 {
701 value_list_t *vl;
703 if (vl_orig == NULL)
704 return (NULL);
706 vl = malloc (sizeof (*vl));
707 if (vl == NULL)
708 return (NULL);
709 memcpy (vl, vl_orig, sizeof (*vl));
711 vl->values = calloc (vl_orig->values_len, sizeof (*vl->values));
712 if (vl->values == NULL)
713 {
714 plugin_value_list_free (vl);
715 return (NULL);
716 }
717 memcpy (vl->values, vl_orig->values,
718 vl_orig->values_len * sizeof (*vl->values));
720 vl->meta = meta_data_clone (vl->meta);
721 if ((vl_orig->meta != NULL) && (vl->meta == NULL))
722 {
723 plugin_value_list_free (vl);
724 return (NULL);
725 }
727 if (vl->time == 0)
728 vl->time = cdtime ();
730 /* Fill in the interval from the thread context, if it is zero. */
731 if (vl->interval == 0)
732 {
733 plugin_ctx_t ctx = plugin_get_ctx ();
735 if (ctx.interval != 0)
736 vl->interval = ctx.interval;
737 else
738 {
739 char name[6 * DATA_MAX_NAME_LEN];
740 FORMAT_VL (name, sizeof (name), vl);
741 ERROR ("plugin_value_list_clone: Unable to determine "
742 "interval from context for "
743 "value list \"%s\". "
744 "This indicates a broken plugin. "
745 "Please report this problem to the "
746 "collectd mailing list or at "
747 "<http://collectd.org/bugs/>.", name);
748 vl->interval = cf_get_default_interval ();
749 }
750 }
752 return (vl);
753 } /* }}} value_list_t *plugin_value_list_clone */
755 static int plugin_write_enqueue (value_list_t const *vl) /* {{{ */
756 {
757 write_queue_t *q;
759 q = malloc (sizeof (*q));
760 if (q == NULL)
761 return (ENOMEM);
762 q->next = NULL;
764 q->vl = plugin_value_list_clone (vl);
765 if (q->vl == NULL)
766 {
767 sfree (q);
768 return (ENOMEM);
769 }
771 /* Store context of caller (read plugin); otherwise, it would not be
772 * available to the write plugins when actually dispatching the
773 * value-list later on. */
774 q->ctx = plugin_get_ctx ();
776 pthread_mutex_lock (&write_lock);
778 if (write_queue_tail == NULL)
779 {
780 write_queue_head = q;
781 write_queue_tail = q;
782 write_queue_length = 1;
783 }
784 else
785 {
786 write_queue_tail->next = q;
787 write_queue_tail = q;
788 write_queue_length += 1;
789 }
791 pthread_cond_signal (&write_cond);
792 pthread_mutex_unlock (&write_lock);
794 return (0);
795 } /* }}} int plugin_write_enqueue */
797 static value_list_t *plugin_write_dequeue (void) /* {{{ */
798 {
799 write_queue_t *q;
800 value_list_t *vl;
802 pthread_mutex_lock (&write_lock);
804 while (write_loop && (write_queue_head == NULL))
805 pthread_cond_wait (&write_cond, &write_lock);
807 if (write_queue_head == NULL)
808 {
809 pthread_mutex_unlock (&write_lock);
810 return (NULL);
811 }
813 q = write_queue_head;
814 write_queue_head = q->next;
815 write_queue_length -= 1;
816 if (write_queue_head == NULL) {
817 write_queue_tail = NULL;
818 assert(0 == write_queue_length);
819 }
821 pthread_mutex_unlock (&write_lock);
823 (void) plugin_set_ctx (q->ctx);
825 vl = q->vl;
826 sfree (q);
827 return (vl);
828 } /* }}} value_list_t *plugin_write_dequeue */
830 static void *plugin_write_thread (void __attribute__((unused)) *args) /* {{{ */
831 {
832 while (write_loop)
833 {
834 value_list_t *vl = plugin_write_dequeue ();
835 if (vl == NULL)
836 continue;
838 plugin_dispatch_values_internal (vl);
840 plugin_value_list_free (vl);
841 }
843 pthread_exit (NULL);
844 return ((void *) 0);
845 } /* }}} void *plugin_write_thread */
847 static void start_write_threads (size_t num) /* {{{ */
848 {
849 size_t i;
851 if (write_threads != NULL)
852 return;
854 write_threads = (pthread_t *) calloc (num, sizeof (pthread_t));
855 if (write_threads == NULL)
856 {
857 ERROR ("plugin: start_write_threads: calloc failed.");
858 return;
859 }
861 write_threads_num = 0;
862 for (i = 0; i < num; i++)
863 {
864 int status;
866 status = pthread_create (write_threads + write_threads_num,
867 /* attr = */ NULL,
868 plugin_write_thread,
869 /* arg = */ NULL);
870 if (status != 0)
871 {
872 char errbuf[1024];
873 ERROR ("plugin: start_write_threads: pthread_create failed "
874 "with status %i (%s).", status,
875 sstrerror (status, errbuf, sizeof (errbuf)));
876 return;
877 }
879 write_threads_num++;
880 } /* for (i) */
881 } /* }}} void start_write_threads */
883 static void stop_write_threads (void) /* {{{ */
884 {
885 write_queue_t *q;
886 int i;
888 if (write_threads == NULL)
889 return;
891 INFO ("collectd: Stopping %zu write threads.", write_threads_num);
893 pthread_mutex_lock (&write_lock);
894 write_loop = 0;
895 DEBUG ("plugin: stop_write_threads: Signalling `write_cond'");
896 pthread_cond_broadcast (&write_cond);
897 pthread_mutex_unlock (&write_lock);
899 for (i = 0; i < write_threads_num; i++)
900 {
901 if (pthread_join (write_threads[i], NULL) != 0)
902 {
903 ERROR ("plugin: stop_write_threads: pthread_join failed.");
904 }
905 write_threads[i] = (pthread_t) 0;
906 }
907 sfree (write_threads);
908 write_threads_num = 0;
910 pthread_mutex_lock (&write_lock);
911 i = 0;
912 for (q = write_queue_head; q != NULL; )
913 {
914 write_queue_t *q1 = q;
915 plugin_value_list_free (q->vl);
916 q = q->next;
917 sfree (q1);
918 i++;
919 }
920 write_queue_head = NULL;
921 write_queue_tail = NULL;
922 write_queue_length = 0;
923 pthread_mutex_unlock (&write_lock);
925 if (i > 0)
926 {
927 WARNING ("plugin: %i value list%s left after shutting down "
928 "the write threads.",
929 i, (i == 1) ? " was" : "s were");
930 }
931 } /* }}} void stop_write_threads */
933 /*
934 * Public functions
935 */
936 void plugin_set_dir (const char *dir)
937 {
938 if (plugindir != NULL)
939 free (plugindir);
941 if (dir == NULL)
942 plugindir = NULL;
943 else if ((plugindir = strdup (dir)) == NULL)
944 {
945 char errbuf[1024];
946 ERROR ("strdup failed: %s",
947 sstrerror (errno, errbuf, sizeof (errbuf)));
948 }
949 }
951 static _Bool plugin_is_loaded (char const *name)
952 {
953 int status;
955 if (plugins_loaded == NULL)
956 plugins_loaded = c_avl_create ((void *) strcasecmp);
957 assert (plugins_loaded != NULL);
959 status = c_avl_get (plugins_loaded, name, /* ret_value = */ NULL);
960 return (status == 0);
961 }
963 static int plugin_mark_loaded (char const *name)
964 {
965 char *name_copy;
966 int status;
968 name_copy = strdup (name);
969 if (name_copy == NULL)
970 return (ENOMEM);
972 status = c_avl_insert (plugins_loaded,
973 /* key = */ name_copy, /* value = */ NULL);
974 return (status);
975 }
977 static void plugin_free_loaded ()
978 {
979 void *key;
980 void *value;
982 if (plugins_loaded == NULL)
983 return;
985 while (c_avl_pick (plugins_loaded, &key, &value) == 0)
986 {
987 sfree (key);
988 assert (value == NULL);
989 }
991 c_avl_destroy (plugins_loaded);
992 plugins_loaded = NULL;
993 }
995 #define BUFSIZE 512
996 int plugin_load (char const *plugin_name, uint32_t flags)
997 {
998 DIR *dh;
999 const char *dir;
1000 char filename[BUFSIZE] = "";
1001 char typename[BUFSIZE];
1002 int ret;
1003 struct stat statbuf;
1004 struct dirent *de;
1005 int status;
1007 if (plugin_name == NULL)
1008 return (EINVAL);
1010 /* Check if plugin is already loaded and don't do anything in this
1011 * case. */
1012 if (plugin_is_loaded (plugin_name))
1013 return (0);
1015 dir = plugin_get_dir ();
1016 ret = 1;
1018 /*
1019 * XXX: Magic at work:
1020 *
1021 * Some of the language bindings, for example the Python and Perl
1022 * plugins, need to be able to export symbols to the scripts they run.
1023 * For this to happen, the "Globals" flag needs to be set.
1024 * Unfortunately, this technical detail is hard to explain to the
1025 * average user and she shouldn't have to worry about this, ideally.
1026 * So in order to save everyone's sanity use a different default for a
1027 * handful of special plugins. --octo
1028 */
1029 if ((strcasecmp ("perl", plugin_name) == 0)
1030 || (strcasecmp ("python", plugin_name) == 0))
1031 flags |= PLUGIN_FLAGS_GLOBAL;
1033 /* `cpu' should not match `cpufreq'. To solve this we add `.so' to the
1034 * type when matching the filename */
1035 status = ssnprintf (typename, sizeof (typename), "%s.so", plugin_name);
1036 if ((status < 0) || ((size_t) status >= sizeof (typename)))
1037 {
1038 WARNING ("plugin_load: Filename too long: \"%s.so\"", plugin_name);
1039 return (-1);
1040 }
1042 if ((dh = opendir (dir)) == NULL)
1043 {
1044 char errbuf[1024];
1045 ERROR ("plugin_load: opendir (%s) failed: %s", dir,
1046 sstrerror (errno, errbuf, sizeof (errbuf)));
1047 return (-1);
1048 }
1050 while ((de = readdir (dh)) != NULL)
1051 {
1052 if (strcasecmp (de->d_name, typename))
1053 continue;
1055 status = ssnprintf (filename, sizeof (filename),
1056 "%s/%s", dir, de->d_name);
1057 if ((status < 0) || ((size_t) status >= sizeof (filename)))
1058 {
1059 WARNING ("plugin_load: Filename too long: \"%s/%s\"",
1060 dir, de->d_name);
1061 continue;
1062 }
1064 if (lstat (filename, &statbuf) == -1)
1065 {
1066 char errbuf[1024];
1067 WARNING ("plugin_load: stat (\"%s\") failed: %s",
1068 filename,
1069 sstrerror (errno, errbuf, sizeof (errbuf)));
1070 continue;
1071 }
1072 else if (!S_ISREG (statbuf.st_mode))
1073 {
1074 /* don't follow symlinks */
1075 WARNING ("plugin_load: %s is not a regular file.",
1076 filename);
1077 continue;
1078 }
1080 status = plugin_load_file (filename, flags);
1081 if (status == 0)
1082 {
1083 /* success */
1084 plugin_mark_loaded (plugin_name);
1085 ret = 0;
1086 break;
1087 }
1088 else
1089 {
1090 ERROR ("plugin_load: Load plugin \"%s\" failed with "
1091 "status %i.", plugin_name, status);
1092 }
1093 }
1095 closedir (dh);
1097 if (filename[0] == 0)
1098 ERROR ("plugin_load: Could not find plugin \"%s\" in %s",
1099 plugin_name, dir);
1101 return (ret);
1102 }
1104 /*
1105 * The `register_*' functions follow
1106 */
1107 int plugin_register_config (const char *name,
1108 int (*callback) (const char *key, const char *val),
1109 const char **keys, int keys_num)
1110 {
1111 cf_register (name, callback, keys, keys_num);
1112 return (0);
1113 } /* int plugin_register_config */
1115 int plugin_register_complex_config (const char *type,
1116 int (*callback) (oconfig_item_t *))
1117 {
1118 return (cf_register_complex (type, callback));
1119 } /* int plugin_register_complex_config */
1121 int plugin_register_init (const char *name,
1122 int (*callback) (void))
1123 {
1124 return (create_register_callback (&list_init, name, (void *) callback,
1125 /* user_data = */ NULL));
1126 } /* plugin_register_init */
1128 static int plugin_compare_read_func (const void *arg0, const void *arg1)
1129 {
1130 const read_func_t *rf0;
1131 const read_func_t *rf1;
1133 rf0 = arg0;
1134 rf1 = arg1;
1136 if (rf0->rf_next_read < rf1->rf_next_read)
1137 return (-1);
1138 else if (rf0->rf_next_read > rf1->rf_next_read)
1139 return (1);
1140 else
1141 return (0);
1142 } /* int plugin_compare_read_func */
1144 /* Add a read function to both, the heap and a linked list. The linked list if
1145 * used to look-up read functions, especially for the remove function. The heap
1146 * is used to determine which plugin to read next. */
1147 static int plugin_insert_read (read_func_t *rf)
1148 {
1149 int status;
1150 llentry_t *le;
1152 rf->rf_next_read = cdtime ();
1153 rf->rf_effective_interval = rf->rf_interval;
1155 pthread_mutex_lock (&read_lock);
1157 if (read_list == NULL)
1158 {
1159 read_list = llist_create ();
1160 if (read_list == NULL)
1161 {
1162 pthread_mutex_unlock (&read_lock);
1163 ERROR ("plugin_insert_read: read_list failed.");
1164 return (-1);
1165 }
1166 }
1168 if (read_heap == NULL)
1169 {
1170 read_heap = c_heap_create (plugin_compare_read_func);
1171 if (read_heap == NULL)
1172 {
1173 pthread_mutex_unlock (&read_lock);
1174 ERROR ("plugin_insert_read: c_heap_create failed.");
1175 return (-1);
1176 }
1177 }
1179 le = llist_search (read_list, rf->rf_name);
1180 if (le != NULL)
1181 {
1182 pthread_mutex_unlock (&read_lock);
1183 WARNING ("The read function \"%s\" is already registered. "
1184 "Check for duplicate \"LoadPlugin\" lines "
1185 "in your configuration!",
1186 rf->rf_name);
1187 return (EINVAL);
1188 }
1190 le = llentry_create (rf->rf_name, rf);
1191 if (le == NULL)
1192 {
1193 pthread_mutex_unlock (&read_lock);
1194 ERROR ("plugin_insert_read: llentry_create failed.");
1195 return (-1);
1196 }
1198 status = c_heap_insert (read_heap, rf);
1199 if (status != 0)
1200 {
1201 pthread_mutex_unlock (&read_lock);
1202 ERROR ("plugin_insert_read: c_heap_insert failed.");
1203 llentry_destroy (le);
1204 return (-1);
1205 }
1207 /* This does not fail. */
1208 llist_append (read_list, le);
1210 /* Wake up all the read threads. */
1211 pthread_cond_broadcast (&read_cond);
1212 pthread_mutex_unlock (&read_lock);
1213 return (0);
1214 } /* int plugin_insert_read */
1216 int plugin_register_read (const char *name,
1217 int (*callback) (void))
1218 {
1219 read_func_t *rf;
1220 int status;
1222 rf = malloc (sizeof (*rf));
1223 if (rf == NULL)
1224 {
1225 ERROR ("plugin_register_read: malloc failed.");
1226 return (ENOMEM);
1227 }
1229 memset (rf, 0, sizeof (read_func_t));
1230 rf->rf_callback = (void *) callback;
1231 rf->rf_udata.data = NULL;
1232 rf->rf_udata.free_func = NULL;
1233 rf->rf_ctx = plugin_get_ctx ();
1234 rf->rf_group[0] = '\0';
1235 rf->rf_name = strdup (name);
1236 rf->rf_type = RF_SIMPLE;
1237 rf->rf_interval = plugin_get_interval ();
1239 status = plugin_insert_read (rf);
1240 if (status != 0) {
1241 sfree (rf->rf_name);
1242 sfree (rf);
1243 }
1245 return (status);
1246 } /* int plugin_register_read */
1248 int plugin_register_complex_read (const char *group, const char *name,
1249 plugin_read_cb callback,
1250 const struct timespec *interval,
1251 user_data_t *user_data)
1252 {
1253 read_func_t *rf;
1254 int status;
1256 rf = malloc (sizeof (*rf));
1257 if (rf == NULL)
1258 {
1259 ERROR ("plugin_register_complex_read: malloc failed.");
1260 return (ENOMEM);
1261 }
1263 memset (rf, 0, sizeof (read_func_t));
1264 rf->rf_callback = (void *) callback;
1265 if (group != NULL)
1266 sstrncpy (rf->rf_group, group, sizeof (rf->rf_group));
1267 else
1268 rf->rf_group[0] = '\0';
1269 rf->rf_name = strdup (name);
1270 rf->rf_type = RF_COMPLEX;
1271 if (interval != NULL)
1272 rf->rf_interval = TIMESPEC_TO_CDTIME_T (interval);
1273 else
1274 rf->rf_interval = plugin_get_interval ();
1276 /* Set user data */
1277 if (user_data == NULL)
1278 {
1279 rf->rf_udata.data = NULL;
1280 rf->rf_udata.free_func = NULL;
1281 }
1282 else
1283 {
1284 rf->rf_udata = *user_data;
1285 }
1287 rf->rf_ctx = plugin_get_ctx ();
1289 status = plugin_insert_read (rf);
1290 if (status != 0) {
1291 sfree (rf->rf_name);
1292 sfree (rf);
1293 }
1295 return (status);
1296 } /* int plugin_register_complex_read */
1298 int plugin_register_write (const char *name,
1299 plugin_write_cb callback, user_data_t *ud)
1300 {
1301 return (create_register_callback (&list_write, name,
1302 (void *) callback, ud));
1303 } /* int plugin_register_write */
1305 int plugin_register_flush (const char *name,
1306 plugin_flush_cb callback, user_data_t *ud)
1307 {
1308 return (create_register_callback (&list_flush, name,
1309 (void *) callback, ud));
1310 } /* int plugin_register_flush */
1312 int plugin_register_missing (const char *name,
1313 plugin_missing_cb callback, user_data_t *ud)
1314 {
1315 return (create_register_callback (&list_missing, name,
1316 (void *) callback, ud));
1317 } /* int plugin_register_missing */
1319 int plugin_register_shutdown (const char *name,
1320 int (*callback) (void))
1321 {
1322 return (create_register_callback (&list_shutdown, name,
1323 (void *) callback, /* user_data = */ NULL));
1324 } /* int plugin_register_shutdown */
1326 static void plugin_free_data_sets (void)
1327 {
1328 void *key;
1329 void *value;
1331 if (data_sets == NULL)
1332 return;
1334 while (c_avl_pick (data_sets, &key, &value) == 0)
1335 {
1336 data_set_t *ds = value;
1337 /* key is a pointer to ds->type */
1339 sfree (ds->ds);
1340 sfree (ds);
1341 }
1343 c_avl_destroy (data_sets);
1344 data_sets = NULL;
1345 } /* void plugin_free_data_sets */
1347 int plugin_register_data_set (const data_set_t *ds)
1348 {
1349 data_set_t *ds_copy;
1350 int i;
1352 if ((data_sets != NULL)
1353 && (c_avl_get (data_sets, ds->type, NULL) == 0))
1354 {
1355 NOTICE ("Replacing DS `%s' with another version.", ds->type);
1356 plugin_unregister_data_set (ds->type);
1357 }
1358 else if (data_sets == NULL)
1359 {
1360 data_sets = c_avl_create ((int (*) (const void *, const void *)) strcmp);
1361 if (data_sets == NULL)
1362 return (-1);
1363 }
1365 ds_copy = (data_set_t *) malloc (sizeof (data_set_t));
1366 if (ds_copy == NULL)
1367 return (-1);
1368 memcpy(ds_copy, ds, sizeof (data_set_t));
1370 ds_copy->ds = (data_source_t *) malloc (sizeof (data_source_t)
1371 * ds->ds_num);
1372 if (ds_copy->ds == NULL)
1373 {
1374 free (ds_copy);
1375 return (-1);
1376 }
1378 for (i = 0; i < ds->ds_num; i++)
1379 memcpy (ds_copy->ds + i, ds->ds + i, sizeof (data_source_t));
1381 return (c_avl_insert (data_sets, (void *) ds_copy->type, (void *) ds_copy));
1382 } /* int plugin_register_data_set */
1384 int plugin_register_log (const char *name,
1385 plugin_log_cb callback, user_data_t *ud)
1386 {
1387 return (create_register_callback (&list_log, name,
1388 (void *) callback, ud));
1389 } /* int plugin_register_log */
1391 int plugin_register_notification (const char *name,
1392 plugin_notification_cb callback, user_data_t *ud)
1393 {
1394 return (create_register_callback (&list_notification, name,
1395 (void *) callback, ud));
1396 } /* int plugin_register_log */
1398 int plugin_unregister_config (const char *name)
1399 {
1400 cf_unregister (name);
1401 return (0);
1402 } /* int plugin_unregister_config */
1404 int plugin_unregister_complex_config (const char *name)
1405 {
1406 cf_unregister_complex (name);
1407 return (0);
1408 } /* int plugin_unregister_complex_config */
1410 int plugin_unregister_init (const char *name)
1411 {
1412 return (plugin_unregister (list_init, name));
1413 }
1415 int plugin_unregister_read (const char *name) /* {{{ */
1416 {
1417 llentry_t *le;
1418 read_func_t *rf;
1420 if (name == NULL)
1421 return (-ENOENT);
1423 pthread_mutex_lock (&read_lock);
1425 if (read_list == NULL)
1426 {
1427 pthread_mutex_unlock (&read_lock);
1428 return (-ENOENT);
1429 }
1431 le = llist_search (read_list, name);
1432 if (le == NULL)
1433 {
1434 pthread_mutex_unlock (&read_lock);
1435 WARNING ("plugin_unregister_read: No such read function: %s",
1436 name);
1437 return (-ENOENT);
1438 }
1440 llist_remove (read_list, le);
1442 rf = le->value;
1443 assert (rf != NULL);
1444 rf->rf_type = RF_REMOVE;
1446 pthread_mutex_unlock (&read_lock);
1448 llentry_destroy (le);
1450 DEBUG ("plugin_unregister_read: Marked `%s' for removal.", name);
1452 return (0);
1453 } /* }}} int plugin_unregister_read */
1455 void plugin_log_available_writers (void)
1456 {
1457 log_list_callbacks (&list_write, "Available write targets:");
1458 }
1460 static int compare_read_func_group (llentry_t *e, void *ud) /* {{{ */
1461 {
1462 read_func_t *rf = e->value;
1463 char *group = ud;
1465 return strcmp (rf->rf_group, (const char *)group);
1466 } /* }}} int compare_read_func_group */
1468 int plugin_unregister_read_group (const char *group) /* {{{ */
1469 {
1470 llentry_t *le;
1471 read_func_t *rf;
1473 int found = 0;
1475 if (group == NULL)
1476 return (-ENOENT);
1478 pthread_mutex_lock (&read_lock);
1480 if (read_list == NULL)
1481 {
1482 pthread_mutex_unlock (&read_lock);
1483 return (-ENOENT);
1484 }
1486 while (42)
1487 {
1488 le = llist_search_custom (read_list,
1489 compare_read_func_group, (void *)group);
1491 if (le == NULL)
1492 break;
1494 ++found;
1496 llist_remove (read_list, le);
1498 rf = le->value;
1499 assert (rf != NULL);
1500 rf->rf_type = RF_REMOVE;
1502 llentry_destroy (le);
1504 DEBUG ("plugin_unregister_read_group: "
1505 "Marked `%s' (group `%s') for removal.",
1506 rf->rf_name, group);
1507 }
1509 pthread_mutex_unlock (&read_lock);
1511 if (found == 0)
1512 {
1513 WARNING ("plugin_unregister_read_group: No such "
1514 "group of read function: %s", group);
1515 return (-ENOENT);
1516 }
1518 return (0);
1519 } /* }}} int plugin_unregister_read_group */
1521 int plugin_unregister_write (const char *name)
1522 {
1523 return (plugin_unregister (list_write, name));
1524 }
1526 int plugin_unregister_flush (const char *name)
1527 {
1528 return (plugin_unregister (list_flush, name));
1529 }
1531 int plugin_unregister_missing (const char *name)
1532 {
1533 return (plugin_unregister (list_missing, name));
1534 }
1536 int plugin_unregister_shutdown (const char *name)
1537 {
1538 return (plugin_unregister (list_shutdown, name));
1539 }
1541 int plugin_unregister_data_set (const char *name)
1542 {
1543 data_set_t *ds;
1545 if (data_sets == NULL)
1546 return (-1);
1548 if (c_avl_remove (data_sets, name, NULL, (void *) &ds) != 0)
1549 return (-1);
1551 sfree (ds->ds);
1552 sfree (ds);
1554 return (0);
1555 } /* int plugin_unregister_data_set */
1557 int plugin_unregister_log (const char *name)
1558 {
1559 return (plugin_unregister (list_log, name));
1560 }
1562 int plugin_unregister_notification (const char *name)
1563 {
1564 return (plugin_unregister (list_notification, name));
1565 }
1567 void plugin_init_all (void)
1568 {
1569 char const *chain_name;
1570 long write_threads_num;
1571 llentry_t *le;
1572 int status;
1574 /* Init the value cache */
1575 uc_init ();
1577 if (IS_TRUE (global_option_get ("CollectInternalStats")))
1578 record_statistics = 1;
1580 chain_name = global_option_get ("PreCacheChain");
1581 pre_cache_chain = fc_chain_get_by_name (chain_name);
1583 chain_name = global_option_get ("PostCacheChain");
1584 post_cache_chain = fc_chain_get_by_name (chain_name);
1586 write_limit_high = global_option_get_long ("WriteQueueLimitHigh",
1587 /* default = */ 0);
1588 if (write_limit_high < 0)
1589 {
1590 ERROR ("WriteQueueLimitHigh must be positive or zero.");
1591 write_limit_high = 0;
1592 }
1594 write_limit_low = global_option_get_long ("WriteQueueLimitLow",
1595 /* default = */ write_limit_high / 2);
1596 if (write_limit_low < 0)
1597 {
1598 ERROR ("WriteQueueLimitLow must be positive or zero.");
1599 write_limit_low = write_limit_high / 2;
1600 }
1601 else if (write_limit_low > write_limit_high)
1602 {
1603 ERROR ("WriteQueueLimitLow must not be larger than "
1604 "WriteQueueLimitHigh.");
1605 write_limit_low = write_limit_high;
1606 }
1608 write_threads_num = global_option_get_long ("WriteThreads",
1609 /* default = */ 5);
1610 if (write_threads_num < 1)
1611 {
1612 ERROR ("WriteThreads must be positive.");
1613 write_threads_num = 5;
1614 }
1616 if ((list_init == NULL) && (read_heap == NULL))
1617 return;
1619 /* Calling all init callbacks before checking if read callbacks
1620 * are available allows the init callbacks to register the read
1621 * callback. */
1622 le = llist_head (list_init);
1623 while (le != NULL)
1624 {
1625 callback_func_t *cf;
1626 plugin_init_cb callback;
1627 plugin_ctx_t old_ctx;
1629 cf = le->value;
1630 old_ctx = plugin_set_ctx (cf->cf_ctx);
1631 callback = cf->cf_callback;
1632 status = (*callback) ();
1633 plugin_set_ctx (old_ctx);
1635 if (status != 0)
1636 {
1637 ERROR ("Initialization of plugin `%s' "
1638 "failed with status %i. "
1639 "Plugin will be unloaded.",
1640 le->key, status);
1641 /* Plugins that register read callbacks from the init
1642 * callback should take care of appropriate error
1643 * handling themselves. */
1644 /* FIXME: Unload _all_ functions */
1645 plugin_unregister_read (le->key);
1646 }
1648 le = le->next;
1649 }
1651 start_write_threads ((size_t) write_threads_num);
1653 max_read_interval = global_option_get_time ("MaxReadInterval",
1654 DEFAULT_MAX_READ_INTERVAL);
1656 /* Start read-threads */
1657 if (read_heap != NULL)
1658 {
1659 const char *rt;
1660 int num;
1662 rt = global_option_get ("ReadThreads");
1663 num = atoi (rt);
1664 if (num != -1)
1665 start_read_threads ((num > 0) ? num : 5);
1666 }
1667 } /* void plugin_init_all */
1669 /* TODO: Rename this function. */
1670 void plugin_read_all (void)
1671 {
1672 if(record_statistics) {
1673 plugin_update_internal_statistics ();
1674 }
1675 uc_check_timeout ();
1677 return;
1678 } /* void plugin_read_all */
1680 /* Read function called when the `-T' command line argument is given. */
1681 int plugin_read_all_once (void)
1682 {
1683 int status;
1684 int return_status = 0;
1686 if (read_heap == NULL)
1687 {
1688 NOTICE ("No read-functions are registered.");
1689 return (0);
1690 }
1692 while (42)
1693 {
1694 read_func_t *rf;
1695 plugin_ctx_t old_ctx;
1697 rf = c_heap_get_root (read_heap);
1698 if (rf == NULL)
1699 break;
1701 old_ctx = plugin_set_ctx (rf->rf_ctx);
1703 if (rf->rf_type == RF_SIMPLE)
1704 {
1705 int (*callback) (void);
1707 callback = rf->rf_callback;
1708 status = (*callback) ();
1709 }
1710 else
1711 {
1712 plugin_read_cb callback;
1714 callback = rf->rf_callback;
1715 status = (*callback) (&rf->rf_udata);
1716 }
1718 plugin_set_ctx (old_ctx);
1720 if (status != 0)
1721 {
1722 NOTICE ("read-function of plugin `%s' failed.",
1723 rf->rf_name);
1724 return_status = -1;
1725 }
1727 sfree (rf->rf_name);
1728 destroy_callback ((void *) rf);
1729 }
1731 return (return_status);
1732 } /* int plugin_read_all_once */
1734 int plugin_write (const char *plugin, /* {{{ */
1735 const data_set_t *ds, const value_list_t *vl)
1736 {
1737 llentry_t *le;
1738 int status;
1740 if (vl == NULL)
1741 return (EINVAL);
1743 if (list_write == NULL)
1744 return (ENOENT);
1746 if (ds == NULL)
1747 {
1748 ds = plugin_get_ds (vl->type);
1749 if (ds == NULL)
1750 {
1751 ERROR ("plugin_write: Unable to lookup type `%s'.", vl->type);
1752 return (ENOENT);
1753 }
1754 }
1756 if (plugin == NULL)
1757 {
1758 int success = 0;
1759 int failure = 0;
1761 le = llist_head (list_write);
1762 while (le != NULL)
1763 {
1764 callback_func_t *cf = le->value;
1765 plugin_write_cb callback;
1767 /* do not switch plugin context; rather keep the context (interval)
1768 * information of the calling read plugin */
1770 DEBUG ("plugin: plugin_write: Writing values via %s.", le->key);
1771 callback = cf->cf_callback;
1772 status = (*callback) (ds, vl, &cf->cf_udata);
1773 if (status != 0)
1774 failure++;
1775 else
1776 success++;
1778 le = le->next;
1779 }
1781 if ((success == 0) && (failure != 0))
1782 status = -1;
1783 else
1784 status = 0;
1785 }
1786 else /* plugin != NULL */
1787 {
1788 callback_func_t *cf;
1789 plugin_write_cb callback;
1791 le = llist_head (list_write);
1792 while (le != NULL)
1793 {
1794 if (strcasecmp (plugin, le->key) == 0)
1795 break;
1797 le = le->next;
1798 }
1800 if (le == NULL)
1801 return (ENOENT);
1803 cf = le->value;
1805 /* do not switch plugin context; rather keep the context (interval)
1806 * information of the calling read plugin */
1808 DEBUG ("plugin: plugin_write: Writing values via %s.", le->key);
1809 callback = cf->cf_callback;
1810 status = (*callback) (ds, vl, &cf->cf_udata);
1811 }
1813 return (status);
1814 } /* }}} int plugin_write */
1816 int plugin_flush (const char *plugin, cdtime_t timeout, const char *identifier)
1817 {
1818 llentry_t *le;
1820 if (list_flush == NULL)
1821 return (0);
1823 le = llist_head (list_flush);
1824 while (le != NULL)
1825 {
1826 callback_func_t *cf;
1827 plugin_flush_cb callback;
1828 plugin_ctx_t old_ctx;
1830 if ((plugin != NULL)
1831 && (strcmp (plugin, le->key) != 0))
1832 {
1833 le = le->next;
1834 continue;
1835 }
1837 cf = le->value;
1838 old_ctx = plugin_set_ctx (cf->cf_ctx);
1839 callback = cf->cf_callback;
1841 (*callback) (timeout, identifier, &cf->cf_udata);
1843 plugin_set_ctx (old_ctx);
1845 le = le->next;
1846 }
1847 return (0);
1848 } /* int plugin_flush */
1850 void plugin_shutdown_all (void)
1851 {
1852 llentry_t *le;
1854 stop_read_threads ();
1856 destroy_all_callbacks (&list_init);
1858 pthread_mutex_lock (&read_lock);
1859 llist_destroy (read_list);
1860 read_list = NULL;
1861 pthread_mutex_unlock (&read_lock);
1863 destroy_read_heap ();
1865 plugin_flush (/* plugin = */ NULL,
1866 /* timeout = */ 0,
1867 /* identifier = */ NULL);
1869 le = NULL;
1870 if (list_shutdown != NULL)
1871 le = llist_head (list_shutdown);
1873 while (le != NULL)
1874 {
1875 callback_func_t *cf;
1876 plugin_shutdown_cb callback;
1877 plugin_ctx_t old_ctx;
1879 cf = le->value;
1880 old_ctx = plugin_set_ctx (cf->cf_ctx);
1881 callback = cf->cf_callback;
1883 /* Advance the pointer before calling the callback allows
1884 * shutdown functions to unregister themselves. If done the
1885 * other way around the memory `le' points to will be freed
1886 * after callback returns. */
1887 le = le->next;
1889 (*callback) ();
1891 plugin_set_ctx (old_ctx);
1892 }
1894 stop_write_threads ();
1896 /* Write plugins which use the `user_data' pointer usually need the
1897 * same data available to the flush callback. If this is the case, set
1898 * the free_function to NULL when registering the flush callback and to
1899 * the real free function when registering the write callback. This way
1900 * the data isn't freed twice. */
1901 destroy_all_callbacks (&list_flush);
1902 destroy_all_callbacks (&list_missing);
1903 destroy_all_callbacks (&list_write);
1905 destroy_all_callbacks (&list_notification);
1906 destroy_all_callbacks (&list_shutdown);
1907 destroy_all_callbacks (&list_log);
1909 plugin_free_loaded ();
1910 plugin_free_data_sets ();
1911 } /* void plugin_shutdown_all */
1913 int plugin_dispatch_missing (const value_list_t *vl) /* {{{ */
1914 {
1915 llentry_t *le;
1917 if (list_missing == NULL)
1918 return (0);
1920 le = llist_head (list_missing);
1921 while (le != NULL)
1922 {
1923 callback_func_t *cf;
1924 plugin_missing_cb callback;
1925 plugin_ctx_t old_ctx;
1926 int status;
1928 cf = le->value;
1929 old_ctx = plugin_set_ctx (cf->cf_ctx);
1930 callback = cf->cf_callback;
1932 status = (*callback) (vl, &cf->cf_udata);
1933 plugin_set_ctx (old_ctx);
1934 if (status != 0)
1935 {
1936 if (status < 0)
1937 {
1938 ERROR ("plugin_dispatch_missing: Callback function \"%s\" "
1939 "failed with status %i.",
1940 le->key, status);
1941 return (status);
1942 }
1943 else
1944 {
1945 return (0);
1946 }
1947 }
1949 le = le->next;
1950 }
1951 return (0);
1952 } /* int }}} plugin_dispatch_missing */
1954 static int plugin_dispatch_values_internal (value_list_t *vl)
1955 {
1956 int status;
1957 static c_complain_t no_write_complaint = C_COMPLAIN_INIT_STATIC;
1959 value_t *saved_values;
1960 int saved_values_len;
1962 data_set_t *ds;
1964 int free_meta_data = 0;
1966 if ((vl == NULL) || (vl->type[0] == 0)
1967 || (vl->values == NULL) || (vl->values_len < 1))
1968 {
1969 ERROR ("plugin_dispatch_values: Invalid value list "
1970 "from plugin %s.", vl->plugin);
1971 return (-1);
1972 }
1974 /* Free meta data only if the calling function didn't specify any. In
1975 * this case matches and targets may add some and the calling function
1976 * may not expect (and therefore free) that data. */
1977 if (vl->meta == NULL)
1978 free_meta_data = 1;
1980 if (list_write == NULL)
1981 c_complain_once (LOG_WARNING, &no_write_complaint,
1982 "plugin_dispatch_values: No write callback has been "
1983 "registered. Please load at least one output plugin, "
1984 "if you want the collected data to be stored.");
1986 if (data_sets == NULL)
1987 {
1988 ERROR ("plugin_dispatch_values: No data sets registered. "
1989 "Could the types database be read? Check "
1990 "your `TypesDB' setting!");
1991 return (-1);
1992 }
1994 if (c_avl_get (data_sets, vl->type, (void *) &ds) != 0)
1995 {
1996 char ident[6 * DATA_MAX_NAME_LEN];
1998 FORMAT_VL (ident, sizeof (ident), vl);
1999 INFO ("plugin_dispatch_values: Dataset not found: %s "
2000 "(from \"%s\"), check your types.db!",
2001 vl->type, ident);
2002 return (-1);
2003 }
2005 /* Assured by plugin_value_list_clone(). The time is determined at
2006 * _enqueue_ time. */
2007 assert (vl->time != 0);
2008 assert (vl->interval != 0);
2010 DEBUG ("plugin_dispatch_values: time = %.3f; interval = %.3f; "
2011 "host = %s; "
2012 "plugin = %s; plugin_instance = %s; "
2013 "type = %s; type_instance = %s;",
2014 CDTIME_T_TO_DOUBLE (vl->time),
2015 CDTIME_T_TO_DOUBLE (vl->interval),
2016 vl->host,
2017 vl->plugin, vl->plugin_instance,
2018 vl->type, vl->type_instance);
2020 #if COLLECT_DEBUG
2021 assert (0 == strcmp (ds->type, vl->type));
2022 #else
2023 if (0 != strcmp (ds->type, vl->type))
2024 WARNING ("plugin_dispatch_values: (ds->type = %s) != (vl->type = %s)",
2025 ds->type, vl->type);
2026 #endif
2028 #if COLLECT_DEBUG
2029 assert (ds->ds_num == vl->values_len);
2030 #else
2031 if (ds->ds_num != vl->values_len)
2032 {
2033 ERROR ("plugin_dispatch_values: ds->type = %s: "
2034 "(ds->ds_num = %i) != "
2035 "(vl->values_len = %i)",
2036 ds->type, ds->ds_num, vl->values_len);
2037 return (-1);
2038 }
2039 #endif
2041 escape_slashes (vl->host, sizeof (vl->host));
2042 escape_slashes (vl->plugin, sizeof (vl->plugin));
2043 escape_slashes (vl->plugin_instance, sizeof (vl->plugin_instance));
2044 escape_slashes (vl->type, sizeof (vl->type));
2045 escape_slashes (vl->type_instance, sizeof (vl->type_instance));
2047 /* Copy the values. This way, we can assure `targets' that they get
2048 * dynamically allocated values, which they can free and replace if
2049 * they like. */
2050 if ((pre_cache_chain != NULL) || (post_cache_chain != NULL))
2051 {
2052 saved_values = vl->values;
2053 saved_values_len = vl->values_len;
2055 vl->values = (value_t *) calloc (vl->values_len,
2056 sizeof (*vl->values));
2057 if (vl->values == NULL)
2058 {
2059 ERROR ("plugin_dispatch_values: calloc failed.");
2060 vl->values = saved_values;
2061 return (-1);
2062 }
2063 memcpy (vl->values, saved_values,
2064 vl->values_len * sizeof (*vl->values));
2065 }
2066 else /* if ((pre == NULL) && (post == NULL)) */
2067 {
2068 saved_values = NULL;
2069 saved_values_len = 0;
2070 }
2072 if (pre_cache_chain != NULL)
2073 {
2074 status = fc_process_chain (ds, vl, pre_cache_chain);
2075 if (status < 0)
2076 {
2077 WARNING ("plugin_dispatch_values: Running the "
2078 "pre-cache chain failed with "
2079 "status %i (%#x).",
2080 status, status);
2081 }
2082 else if (status == FC_TARGET_STOP)
2083 {
2084 /* Restore the state of the value_list so that plugins
2085 * don't get confused.. */
2086 if (saved_values != NULL)
2087 {
2088 free (vl->values);
2089 vl->values = saved_values;
2090 vl->values_len = saved_values_len;
2091 }
2092 return (0);
2093 }
2094 }
2096 /* Update the value cache */
2097 uc_update (ds, vl);
2099 if (post_cache_chain != NULL)
2100 {
2101 status = fc_process_chain (ds, vl, post_cache_chain);
2102 if (status < 0)
2103 {
2104 WARNING ("plugin_dispatch_values: Running the "
2105 "post-cache chain failed with "
2106 "status %i (%#x).",
2107 status, status);
2108 }
2109 }
2110 else
2111 fc_default_action (ds, vl);
2113 /* Restore the state of the value_list so that plugins don't get
2114 * confused.. */
2115 if (saved_values != NULL)
2116 {
2117 free (vl->values);
2118 vl->values = saved_values;
2119 vl->values_len = saved_values_len;
2120 }
2122 if ((free_meta_data != 0) && (vl->meta != NULL))
2123 {
2124 meta_data_destroy (vl->meta);
2125 vl->meta = NULL;
2126 }
2128 return (0);
2129 } /* int plugin_dispatch_values_internal */
2131 static double get_drop_probability (void) /* {{{ */
2132 {
2133 long pos;
2134 long size;
2135 long wql;
2137 pthread_mutex_lock (&write_lock);
2138 wql = write_queue_length;
2139 pthread_mutex_unlock (&write_lock);
2141 if (wql < write_limit_low)
2142 return (0.0);
2143 if (wql >= write_limit_high)
2144 return (1.0);
2146 pos = 1 + wql - write_limit_low;
2147 size = 1 + write_limit_high - write_limit_low;
2149 return (((double) pos) / ((double) size));
2150 } /* }}} double get_drop_probability */
2152 static _Bool check_drop_value (void) /* {{{ */
2153 {
2154 static cdtime_t last_message_time = 0;
2155 static pthread_mutex_t last_message_lock = PTHREAD_MUTEX_INITIALIZER;
2157 double p;
2158 double q;
2159 int status;
2161 if (write_limit_high == 0)
2162 return (0);
2164 p = get_drop_probability ();
2165 if (p == 0.0)
2166 return (0);
2168 status = pthread_mutex_trylock (&last_message_lock);
2169 if (status == 0)
2170 {
2171 cdtime_t now;
2173 now = cdtime ();
2174 if ((now - last_message_time) > TIME_T_TO_CDTIME_T (1))
2175 {
2176 last_message_time = now;
2177 ERROR ("plugin_dispatch_values: Low water mark "
2178 "reached. Dropping %.0f%% of metrics.",
2179 100.0 * p);
2180 }
2181 pthread_mutex_unlock (&last_message_lock);
2182 }
2184 if (p == 1.0)
2185 return (1);
2187 q = cdrand_d ();
2188 if (q > p)
2189 return (1);
2190 else
2191 return (0);
2192 } /* }}} _Bool check_drop_value */
2194 int plugin_dispatch_values (value_list_t const *vl)
2195 {
2196 int status;
2197 static pthread_mutex_t statistics_lock = PTHREAD_MUTEX_INITIALIZER;
2199 if (check_drop_value ()) {
2200 if(record_statistics) {
2201 pthread_mutex_lock(&statistics_lock);
2202 stats_values_dropped++;
2203 pthread_mutex_unlock(&statistics_lock);
2204 }
2205 return (0);
2206 }
2208 status = plugin_write_enqueue (vl);
2209 if (status != 0)
2210 {
2211 char errbuf[1024];
2212 ERROR ("plugin_dispatch_values: plugin_write_enqueue failed "
2213 "with status %i (%s).", status,
2214 sstrerror (status, errbuf, sizeof (errbuf)));
2215 return (status);
2216 }
2218 return (0);
2219 }
2221 __attribute__((sentinel))
2222 int plugin_dispatch_multivalue (value_list_t const *template, /* {{{ */
2223 _Bool store_percentage, int store_type, ...)
2224 {
2225 value_list_t *vl;
2226 int failed = 0;
2227 gauge_t sum = 0.0;
2228 va_list ap;
2230 assert (template->values_len == 1);
2232 /* Calculate sum for Gauge to calculate percent if needed */
2233 if (DS_TYPE_GAUGE == store_type) {
2234 va_start (ap, store_type);
2235 while (42)
2236 {
2237 char const *name;
2238 gauge_t value;
2240 name = va_arg (ap, char const *);
2241 if (name == NULL)
2242 break;
2244 value = va_arg (ap, gauge_t);
2245 if (!isnan (value))
2246 sum += value;
2247 }
2248 va_end (ap);
2249 }
2252 vl = plugin_value_list_clone (template);
2253 /* plugin_value_list_clone makes sure vl->time is set to non-zero. */
2254 if (store_percentage)
2255 sstrncpy (vl->type, "percent", sizeof (vl->type));
2257 va_start (ap, store_type);
2258 while (42)
2259 {
2260 char const *name;
2261 int status;
2263 /* Set the type instance. */
2264 name = va_arg (ap, char const *);
2265 if (name == NULL)
2266 break;
2267 sstrncpy (vl->type_instance, name, sizeof (vl->type_instance));
2269 /* Set the value. */
2270 switch (store_type)
2271 {
2272 case DS_TYPE_GAUGE:
2273 vl->values[0].gauge = va_arg (ap, gauge_t);
2274 if (store_percentage)
2275 vl->values[0].gauge *= 100.0 / sum;
2276 break;
2277 case DS_TYPE_ABSOLUTE:
2278 vl->values[0].absolute = va_arg (ap, absolute_t);
2279 break;
2280 case DS_TYPE_COUNTER:
2281 vl->values[0].counter = va_arg (ap, counter_t);
2282 break;
2283 case DS_TYPE_DERIVE:
2284 vl->values[0].derive = va_arg (ap, derive_t);
2285 break;
2286 default:
2287 ERROR ("plugin_dispatch_multivalue: given store_type is incorrect.");
2288 failed++;
2289 }
2292 status = plugin_write_enqueue (vl);
2293 if (status != 0)
2294 failed++;
2295 }
2296 va_end (ap);
2298 plugin_value_list_free (vl);
2299 return (failed);
2300 } /* }}} int plugin_dispatch_multivalue */
2302 int plugin_dispatch_notification (const notification_t *notif)
2303 {
2304 llentry_t *le;
2305 /* Possible TODO: Add flap detection here */
2307 DEBUG ("plugin_dispatch_notification: severity = %i; message = %s; "
2308 "time = %.3f; host = %s;",
2309 notif->severity, notif->message,
2310 CDTIME_T_TO_DOUBLE (notif->time), notif->host);
2312 /* Nobody cares for notifications */
2313 if (list_notification == NULL)
2314 return (-1);
2316 le = llist_head (list_notification);
2317 while (le != NULL)
2318 {
2319 callback_func_t *cf;
2320 plugin_notification_cb callback;
2321 int status;
2323 /* do not switch plugin context; rather keep the context
2324 * (interval) information of the calling plugin */
2326 cf = le->value;
2327 callback = cf->cf_callback;
2328 status = (*callback) (notif, &cf->cf_udata);
2329 if (status != 0)
2330 {
2331 WARNING ("plugin_dispatch_notification: Notification "
2332 "callback %s returned %i.",
2333 le->key, status);
2334 }
2336 le = le->next;
2337 }
2339 return (0);
2340 } /* int plugin_dispatch_notification */
2342 void plugin_log (int level, const char *format, ...)
2343 {
2344 char msg[1024];
2345 va_list ap;
2346 llentry_t *le;
2348 #if !COLLECT_DEBUG
2349 if (level >= LOG_DEBUG)
2350 return;
2351 #endif
2353 va_start (ap, format);
2354 vsnprintf (msg, sizeof (msg), format, ap);
2355 msg[sizeof (msg) - 1] = '\0';
2356 va_end (ap);
2358 if (list_log == NULL)
2359 {
2360 fprintf (stderr, "%s\n", msg);
2361 return;
2362 }
2364 le = llist_head (list_log);
2365 while (le != NULL)
2366 {
2367 callback_func_t *cf;
2368 plugin_log_cb callback;
2370 cf = le->value;
2371 callback = cf->cf_callback;
2373 /* do not switch plugin context; rather keep the context
2374 * (interval) information of the calling plugin */
2376 (*callback) (level, msg, &cf->cf_udata);
2378 le = le->next;
2379 }
2380 } /* void plugin_log */
2382 int parse_log_severity (const char *severity)
2383 {
2384 int log_level = -1;
2386 if ((0 == strcasecmp (severity, "emerg"))
2387 || (0 == strcasecmp (severity, "alert"))
2388 || (0 == strcasecmp (severity, "crit"))
2389 || (0 == strcasecmp (severity, "err")))
2390 log_level = LOG_ERR;
2391 else if (0 == strcasecmp (severity, "warning"))
2392 log_level = LOG_WARNING;
2393 else if (0 == strcasecmp (severity, "notice"))
2394 log_level = LOG_NOTICE;
2395 else if (0 == strcasecmp (severity, "info"))
2396 log_level = LOG_INFO;
2397 #if COLLECT_DEBUG
2398 else if (0 == strcasecmp (severity, "debug"))
2399 log_level = LOG_DEBUG;
2400 #endif /* COLLECT_DEBUG */
2402 return (log_level);
2403 } /* int parse_log_severity */
2405 int parse_notif_severity (const char *severity)
2406 {
2407 int notif_severity = -1;
2409 if (strcasecmp (severity, "FAILURE") == 0)
2410 notif_severity = NOTIF_FAILURE;
2411 else if (strcmp (severity, "OKAY") == 0)
2412 notif_severity = NOTIF_OKAY;
2413 else if ((strcmp (severity, "WARNING") == 0)
2414 || (strcmp (severity, "WARN") == 0))
2415 notif_severity = NOTIF_WARNING;
2417 return (notif_severity);
2418 } /* int parse_notif_severity */
2420 const data_set_t *plugin_get_ds (const char *name)
2421 {
2422 data_set_t *ds;
2424 if (data_sets == NULL)
2425 {
2426 ERROR ("plugin_get_ds: No data sets are defined yet.");
2427 return (NULL);
2428 }
2430 if (c_avl_get (data_sets, name, (void *) &ds) != 0)
2431 {
2432 DEBUG ("No such dataset registered: %s", name);
2433 return (NULL);
2434 }
2436 return (ds);
2437 } /* data_set_t *plugin_get_ds */
2439 static int plugin_notification_meta_add (notification_t *n,
2440 const char *name,
2441 enum notification_meta_type_e type,
2442 const void *value)
2443 {
2444 notification_meta_t *meta;
2445 notification_meta_t *tail;
2447 if ((n == NULL) || (name == NULL) || (value == NULL))
2448 {
2449 ERROR ("plugin_notification_meta_add: A pointer is NULL!");
2450 return (-1);
2451 }
2453 meta = (notification_meta_t *) malloc (sizeof (notification_meta_t));
2454 if (meta == NULL)
2455 {
2456 ERROR ("plugin_notification_meta_add: malloc failed.");
2457 return (-1);
2458 }
2459 memset (meta, 0, sizeof (notification_meta_t));
2461 sstrncpy (meta->name, name, sizeof (meta->name));
2462 meta->type = type;
2464 switch (type)
2465 {
2466 case NM_TYPE_STRING:
2467 {
2468 meta->nm_value.nm_string = strdup ((const char *) value);
2469 if (meta->nm_value.nm_string == NULL)
2470 {
2471 ERROR ("plugin_notification_meta_add: strdup failed.");
2472 sfree (meta);
2473 return (-1);
2474 }
2475 break;
2476 }
2477 case NM_TYPE_SIGNED_INT:
2478 {
2479 meta->nm_value.nm_signed_int = *((int64_t *) value);
2480 break;
2481 }
2482 case NM_TYPE_UNSIGNED_INT:
2483 {
2484 meta->nm_value.nm_unsigned_int = *((uint64_t *) value);
2485 break;
2486 }
2487 case NM_TYPE_DOUBLE:
2488 {
2489 meta->nm_value.nm_double = *((double *) value);
2490 break;
2491 }
2492 case NM_TYPE_BOOLEAN:
2493 {
2494 meta->nm_value.nm_boolean = *((_Bool *) value);
2495 break;
2496 }
2497 default:
2498 {
2499 ERROR ("plugin_notification_meta_add: Unknown type: %i", type);
2500 sfree (meta);
2501 return (-1);
2502 }
2503 } /* switch (type) */
2505 meta->next = NULL;
2506 tail = n->meta;
2507 while ((tail != NULL) && (tail->next != NULL))
2508 tail = tail->next;
2510 if (tail == NULL)
2511 n->meta = meta;
2512 else
2513 tail->next = meta;
2515 return (0);
2516 } /* int plugin_notification_meta_add */
2518 int plugin_notification_meta_add_string (notification_t *n,
2519 const char *name,
2520 const char *value)
2521 {
2522 return (plugin_notification_meta_add (n, name, NM_TYPE_STRING, value));
2523 }
2525 int plugin_notification_meta_add_signed_int (notification_t *n,
2526 const char *name,
2527 int64_t value)
2528 {
2529 return (plugin_notification_meta_add (n, name, NM_TYPE_SIGNED_INT, &value));
2530 }
2532 int plugin_notification_meta_add_unsigned_int (notification_t *n,
2533 const char *name,
2534 uint64_t value)
2535 {
2536 return (plugin_notification_meta_add (n, name, NM_TYPE_UNSIGNED_INT, &value));
2537 }
2539 int plugin_notification_meta_add_double (notification_t *n,
2540 const char *name,
2541 double value)
2542 {
2543 return (plugin_notification_meta_add (n, name, NM_TYPE_DOUBLE, &value));
2544 }
2546 int plugin_notification_meta_add_boolean (notification_t *n,
2547 const char *name,
2548 _Bool value)
2549 {
2550 return (plugin_notification_meta_add (n, name, NM_TYPE_BOOLEAN, &value));
2551 }
2553 int plugin_notification_meta_copy (notification_t *dst,
2554 const notification_t *src)
2555 {
2556 notification_meta_t *meta;
2558 assert (dst != NULL);
2559 assert (src != NULL);
2560 assert (dst != src);
2561 assert ((src->meta == NULL) || (src->meta != dst->meta));
2563 for (meta = src->meta; meta != NULL; meta = meta->next)
2564 {
2565 if (meta->type == NM_TYPE_STRING)
2566 plugin_notification_meta_add_string (dst, meta->name,
2567 meta->nm_value.nm_string);
2568 else if (meta->type == NM_TYPE_SIGNED_INT)
2569 plugin_notification_meta_add_signed_int (dst, meta->name,
2570 meta->nm_value.nm_signed_int);
2571 else if (meta->type == NM_TYPE_UNSIGNED_INT)
2572 plugin_notification_meta_add_unsigned_int (dst, meta->name,
2573 meta->nm_value.nm_unsigned_int);
2574 else if (meta->type == NM_TYPE_DOUBLE)
2575 plugin_notification_meta_add_double (dst, meta->name,
2576 meta->nm_value.nm_double);
2577 else if (meta->type == NM_TYPE_BOOLEAN)
2578 plugin_notification_meta_add_boolean (dst, meta->name,
2579 meta->nm_value.nm_boolean);
2580 }
2582 return (0);
2583 } /* int plugin_notification_meta_copy */
2585 int plugin_notification_meta_free (notification_meta_t *n)
2586 {
2587 notification_meta_t *this;
2588 notification_meta_t *next;
2590 if (n == NULL)
2591 {
2592 ERROR ("plugin_notification_meta_free: n == NULL!");
2593 return (-1);
2594 }
2596 this = n;
2597 while (this != NULL)
2598 {
2599 next = this->next;
2601 if (this->type == NM_TYPE_STRING)
2602 {
2603 free ((char *)this->nm_value.nm_string);
2604 this->nm_value.nm_string = NULL;
2605 }
2606 sfree (this);
2608 this = next;
2609 }
2611 return (0);
2612 } /* int plugin_notification_meta_free */
2614 static void plugin_ctx_destructor (void *ctx)
2615 {
2616 sfree (ctx);
2617 } /* void plugin_ctx_destructor */
2619 static plugin_ctx_t ctx_init = { /* interval = */ 0 };
2621 static plugin_ctx_t *plugin_ctx_create (void)
2622 {
2623 plugin_ctx_t *ctx;
2625 ctx = malloc (sizeof (*ctx));
2626 if (ctx == NULL) {
2627 char errbuf[1024];
2628 ERROR ("Failed to allocate plugin context: %s",
2629 sstrerror (errno, errbuf, sizeof (errbuf)));
2630 return NULL;
2631 }
2633 *ctx = ctx_init;
2634 assert (plugin_ctx_key_initialized);
2635 pthread_setspecific (plugin_ctx_key, ctx);
2636 DEBUG("Created new plugin context.");
2637 return (ctx);
2638 } /* int plugin_ctx_create */
2640 void plugin_init_ctx (void)
2641 {
2642 pthread_key_create (&plugin_ctx_key, plugin_ctx_destructor);
2643 plugin_ctx_key_initialized = 1;
2644 } /* void plugin_init_ctx */
2646 plugin_ctx_t plugin_get_ctx (void)
2647 {
2648 plugin_ctx_t *ctx;
2650 assert (plugin_ctx_key_initialized);
2651 ctx = pthread_getspecific (plugin_ctx_key);
2653 if (ctx == NULL) {
2654 ctx = plugin_ctx_create ();
2655 /* this must no happen -- exit() instead? */
2656 if (ctx == NULL)
2657 return ctx_init;
2658 }
2660 return (*ctx);
2661 } /* plugin_ctx_t plugin_get_ctx */
2663 plugin_ctx_t plugin_set_ctx (plugin_ctx_t ctx)
2664 {
2665 plugin_ctx_t *c;
2666 plugin_ctx_t old;
2668 assert (plugin_ctx_key_initialized);
2669 c = pthread_getspecific (plugin_ctx_key);
2671 if (c == NULL) {
2672 c = plugin_ctx_create ();
2673 /* this must no happen -- exit() instead? */
2674 if (c == NULL)
2675 return ctx_init;
2676 }
2678 old = *c;
2679 *c = ctx;
2681 return (old);
2682 } /* void plugin_set_ctx */
2684 cdtime_t plugin_get_interval (void)
2685 {
2686 cdtime_t interval;
2688 interval = plugin_get_ctx().interval;
2689 if (interval > 0)
2690 return interval;
2692 return cf_get_default_interval ();
2693 } /* cdtime_t plugin_get_interval */
2695 typedef struct {
2696 plugin_ctx_t ctx;
2697 void *(*start_routine) (void *);
2698 void *arg;
2699 } plugin_thread_t;
2701 static void *plugin_thread_start (void *arg)
2702 {
2703 plugin_thread_t *plugin_thread = arg;
2705 void *(*start_routine) (void *) = plugin_thread->start_routine;
2706 void *plugin_arg = plugin_thread->arg;
2708 plugin_set_ctx (plugin_thread->ctx);
2710 free (plugin_thread);
2712 return start_routine (plugin_arg);
2713 } /* void *plugin_thread_start */
2715 int plugin_thread_create (pthread_t *thread, const pthread_attr_t *attr,
2716 void *(*start_routine) (void *), void *arg)
2717 {
2718 plugin_thread_t *plugin_thread;
2720 plugin_thread = malloc (sizeof (*plugin_thread));
2721 if (plugin_thread == NULL)
2722 return -1;
2724 plugin_thread->ctx = plugin_get_ctx ();
2725 plugin_thread->start_routine = start_routine;
2726 plugin_thread->arg = arg;
2728 return pthread_create (thread, attr,
2729 plugin_thread_start, plugin_thread);
2730 } /* int plugin_thread_create */
2732 /* vim: set sw=8 ts=8 noet fdm=marker : */