9c455417c82c35f0f0a87d320e12a79f9ccf8a8c
1 /**
2 * collectd - src/plugin.c
3 * Copyright (C) 2005-2013 Florian octo Forster
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; only version 2 of the License is applicable.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 *
18 * Authors:
19 * Florian octo Forster <octo at collectd.org>
20 * Sebastian Harl <sh at tokkee.org>
21 **/
23 #include "collectd.h"
24 #include "common.h"
25 #include "plugin.h"
26 #include "configfile.h"
27 #include "filter_chain.h"
28 #include "utils_avltree.h"
29 #include "utils_cache.h"
30 #include "utils_complain.h"
31 #include "utils_llist.h"
32 #include "utils_heap.h"
33 #include "utils_time.h"
34 #include "utils_random.h"
36 #if HAVE_PTHREAD_H
37 # include <pthread.h>
38 #endif
40 #include <ltdl.h>
42 /*
43 * Private structures
44 */
45 struct callback_func_s
46 {
47 void *cf_callback;
48 user_data_t cf_udata;
49 plugin_ctx_t cf_ctx;
50 };
51 typedef struct callback_func_s callback_func_t;
53 #define RF_SIMPLE 0
54 #define RF_COMPLEX 1
55 #define RF_REMOVE 65535
56 struct read_func_s
57 {
58 /* `read_func_t' "inherits" from `callback_func_t'.
59 * The `rf_super' member MUST be the first one in this structure! */
60 #define rf_callback rf_super.cf_callback
61 #define rf_udata rf_super.cf_udata
62 #define rf_ctx rf_super.cf_ctx
63 callback_func_t rf_super;
64 char rf_group[DATA_MAX_NAME_LEN];
65 char *rf_name;
66 int rf_type;
67 cdtime_t rf_interval;
68 cdtime_t rf_effective_interval;
69 cdtime_t rf_next_read;
70 };
71 typedef struct read_func_s read_func_t;
73 struct write_queue_s;
74 typedef struct write_queue_s write_queue_t;
75 struct write_queue_s
76 {
77 value_list_t *vl;
78 plugin_ctx_t ctx;
79 write_queue_t *next;
80 };
82 /*
83 * Private variables
84 */
85 static c_avl_tree_t *plugins_loaded = NULL;
87 static llist_t *list_init;
88 static llist_t *list_write;
89 static llist_t *list_flush;
90 static llist_t *list_missing;
91 static llist_t *list_shutdown;
92 static llist_t *list_log;
93 static llist_t *list_notification;
95 static fc_chain_t *pre_cache_chain = NULL;
96 static fc_chain_t *post_cache_chain = NULL;
98 static c_avl_tree_t *data_sets;
100 static char *plugindir = NULL;
102 static c_heap_t *read_heap = NULL;
103 static llist_t *read_list;
104 static int read_loop = 1;
105 static pthread_mutex_t read_lock = PTHREAD_MUTEX_INITIALIZER;
106 static pthread_cond_t read_cond = PTHREAD_COND_INITIALIZER;
107 static pthread_t *read_threads = NULL;
108 static int read_threads_num = 0;
110 static write_queue_t *write_queue_head;
111 static write_queue_t *write_queue_tail;
112 static long write_queue_length = 0;
113 static _Bool write_loop = 1;
114 static pthread_mutex_t write_lock = PTHREAD_MUTEX_INITIALIZER;
115 static pthread_cond_t write_cond = PTHREAD_COND_INITIALIZER;
116 static pthread_t *write_threads = NULL;
117 static size_t write_threads_num = 0;
119 static pthread_key_t plugin_ctx_key;
120 static _Bool plugin_ctx_key_initialized = 0;
122 static long write_limit_high = 0;
123 static long write_limit_low = 0;
125 /*
126 * Static functions
127 */
128 static int plugin_dispatch_values_internal (value_list_t *vl);
130 static const char *plugin_get_dir (void)
131 {
132 if (plugindir == NULL)
133 return (PLUGINDIR);
134 else
135 return (plugindir);
136 }
138 static void destroy_callback (callback_func_t *cf) /* {{{ */
139 {
140 if (cf == NULL)
141 return;
143 if ((cf->cf_udata.data != NULL) && (cf->cf_udata.free_func != NULL))
144 {
145 cf->cf_udata.free_func (cf->cf_udata.data);
146 cf->cf_udata.data = NULL;
147 cf->cf_udata.free_func = NULL;
148 }
149 sfree (cf);
150 } /* }}} void destroy_callback */
152 static void destroy_all_callbacks (llist_t **list) /* {{{ */
153 {
154 llentry_t *le;
156 if (*list == NULL)
157 return;
159 le = llist_head (*list);
160 while (le != NULL)
161 {
162 llentry_t *le_next;
164 le_next = le->next;
166 sfree (le->key);
167 destroy_callback (le->value);
168 le->value = NULL;
170 le = le_next;
171 }
173 llist_destroy (*list);
174 *list = NULL;
175 } /* }}} void destroy_all_callbacks */
177 static void destroy_read_heap (void) /* {{{ */
178 {
179 if (read_heap == NULL)
180 return;
182 while (42)
183 {
184 read_func_t *rf;
186 rf = c_heap_get_root (read_heap);
187 if (rf == NULL)
188 break;
189 sfree (rf->rf_name);
190 destroy_callback ((callback_func_t *) rf);
191 }
193 c_heap_destroy (read_heap);
194 read_heap = NULL;
195 } /* }}} void destroy_read_heap */
197 static int register_callback (llist_t **list, /* {{{ */
198 const char *name, callback_func_t *cf)
199 {
200 llentry_t *le;
201 char *key;
203 if (*list == NULL)
204 {
205 *list = llist_create ();
206 if (*list == NULL)
207 {
208 ERROR ("plugin: register_callback: "
209 "llist_create failed.");
210 destroy_callback (cf);
211 return (-1);
212 }
213 }
215 key = strdup (name);
216 if (key == NULL)
217 {
218 ERROR ("plugin: register_callback: strdup failed.");
219 destroy_callback (cf);
220 return (-1);
221 }
223 le = llist_search (*list, name);
224 if (le == NULL)
225 {
226 le = llentry_create (key, cf);
227 if (le == NULL)
228 {
229 ERROR ("plugin: register_callback: "
230 "llentry_create failed.");
231 free (key);
232 destroy_callback (cf);
233 return (-1);
234 }
236 llist_append (*list, le);
237 }
238 else
239 {
240 callback_func_t *old_cf;
242 old_cf = le->value;
243 le->value = cf;
245 WARNING ("plugin: register_callback: "
246 "a callback named `%s' already exists - "
247 "overwriting the old entry!", name);
249 destroy_callback (old_cf);
250 sfree (key);
251 }
253 return (0);
254 } /* }}} int register_callback */
256 static int create_register_callback (llist_t **list, /* {{{ */
257 const char *name, void *callback, user_data_t *ud)
258 {
259 callback_func_t *cf;
261 cf = (callback_func_t *) malloc (sizeof (*cf));
262 if (cf == NULL)
263 {
264 ERROR ("plugin: create_register_callback: malloc failed.");
265 return (-1);
266 }
267 memset (cf, 0, sizeof (*cf));
269 cf->cf_callback = callback;
270 if (ud == NULL)
271 {
272 cf->cf_udata.data = NULL;
273 cf->cf_udata.free_func = NULL;
274 }
275 else
276 {
277 cf->cf_udata = *ud;
278 }
280 cf->cf_ctx = plugin_get_ctx ();
282 return (register_callback (list, name, cf));
283 } /* }}} int create_register_callback */
285 static int plugin_unregister (llist_t *list, const char *name) /* {{{ */
286 {
287 llentry_t *e;
289 if (list == NULL)
290 return (-1);
292 e = llist_search (list, name);
293 if (e == NULL)
294 return (-1);
296 llist_remove (list, e);
298 sfree (e->key);
299 destroy_callback (e->value);
301 llentry_destroy (e);
303 return (0);
304 } /* }}} int plugin_unregister */
306 /*
307 * (Try to) load the shared object `file'. Won't complain if it isn't a shared
308 * object, but it will bitch about a shared object not having a
309 * ``module_register'' symbol..
310 */
311 static int plugin_load_file (char *file, uint32_t flags)
312 {
313 lt_dlhandle dlh;
314 void (*reg_handle) (void);
316 lt_dlinit ();
317 lt_dlerror (); /* clear errors */
319 #if LIBTOOL_VERSION == 2
320 if (flags & PLUGIN_FLAGS_GLOBAL) {
321 lt_dladvise advise;
322 lt_dladvise_init(&advise);
323 lt_dladvise_global(&advise);
324 dlh = lt_dlopenadvise(file, advise);
325 lt_dladvise_destroy(&advise);
326 } else {
327 dlh = lt_dlopen (file);
328 }
329 #else /* if LIBTOOL_VERSION == 1 */
330 if (flags & PLUGIN_FLAGS_GLOBAL)
331 WARNING ("plugin_load_file: The global flag is not supported, "
332 "libtool 2 is required for this.");
333 dlh = lt_dlopen (file);
334 #endif
336 if (dlh == NULL)
337 {
338 char errbuf[1024] = "";
340 ssnprintf (errbuf, sizeof (errbuf),
341 "lt_dlopen (\"%s\") failed: %s. "
342 "The most common cause for this problem is "
343 "missing dependencies. Use ldd(1) to check "
344 "the dependencies of the plugin "
345 "/ shared object.",
346 file, lt_dlerror ());
348 ERROR ("%s", errbuf);
349 /* Make sure this is printed to STDERR in any case, but also
350 * make sure it's printed only once. */
351 if (list_log != NULL)
352 fprintf (stderr, "ERROR: %s\n", errbuf);
354 return (1);
355 }
357 if ((reg_handle = (void (*) (void)) lt_dlsym (dlh, "module_register")) == NULL)
358 {
359 WARNING ("Couldn't find symbol \"module_register\" in \"%s\": %s\n",
360 file, lt_dlerror ());
361 lt_dlclose (dlh);
362 return (-1);
363 }
365 (*reg_handle) ();
367 return (0);
368 }
370 static void *plugin_read_thread (void __attribute__((unused)) *args)
371 {
372 while (read_loop != 0)
373 {
374 read_func_t *rf;
375 plugin_ctx_t old_ctx;
376 cdtime_t now;
377 int status;
378 int rf_type;
379 int rc;
381 /* Get the read function that needs to be read next.
382 * We don't need to hold "read_lock" for the heap, but we need
383 * to call c_heap_get_root() and pthread_cond_wait() in the
384 * same protected block. */
385 pthread_mutex_lock (&read_lock);
386 rf = c_heap_get_root (read_heap);
387 if (rf == NULL)
388 {
389 pthread_cond_wait (&read_cond, &read_lock);
390 pthread_mutex_unlock (&read_lock);
391 continue;
392 }
393 pthread_mutex_unlock (&read_lock);
395 if (rf->rf_interval == 0)
396 {
397 /* this should not happen, because the interval is set
398 * for each plugin when loading it
399 * XXX: issue a warning? */
400 rf->rf_interval = plugin_get_interval ();
401 rf->rf_effective_interval = rf->rf_interval;
403 rf->rf_next_read = cdtime ();
404 }
406 /* sleep until this entry is due,
407 * using pthread_cond_timedwait */
408 pthread_mutex_lock (&read_lock);
409 /* In pthread_cond_timedwait, spurious wakeups are possible
410 * (and really happen, at least on NetBSD with > 1 CPU), thus
411 * we need to re-evaluate the condition every time
412 * pthread_cond_timedwait returns. */
413 rc = 0;
414 while ((read_loop != 0)
415 && (cdtime () < rf->rf_next_read)
416 && rc == 0)
417 {
418 struct timespec ts = { 0 };
420 CDTIME_T_TO_TIMESPEC (rf->rf_next_read, &ts);
422 rc = pthread_cond_timedwait (&read_cond, &read_lock,
423 &ts);
424 }
426 /* Must hold `read_lock' when accessing `rf->rf_type'. */
427 rf_type = rf->rf_type;
428 pthread_mutex_unlock (&read_lock);
430 /* Check if we're supposed to stop.. This may have interrupted
431 * the sleep, too. */
432 if (read_loop == 0)
433 {
434 /* Insert `rf' again, so it can be free'd correctly */
435 c_heap_insert (read_heap, rf);
436 break;
437 }
439 /* The entry has been marked for deletion. The linked list
440 * entry has already been removed by `plugin_unregister_read'.
441 * All we have to do here is free the `read_func_t' and
442 * continue. */
443 if (rf_type == RF_REMOVE)
444 {
445 DEBUG ("plugin_read_thread: Destroying the `%s' "
446 "callback.", rf->rf_name);
447 sfree (rf->rf_name);
448 destroy_callback ((callback_func_t *) rf);
449 rf = NULL;
450 continue;
451 }
453 DEBUG ("plugin_read_thread: Handling `%s'.", rf->rf_name);
455 old_ctx = plugin_set_ctx (rf->rf_ctx);
457 if (rf_type == RF_SIMPLE)
458 {
459 int (*callback) (void);
461 callback = rf->rf_callback;
462 status = (*callback) ();
463 }
464 else
465 {
466 plugin_read_cb callback;
468 assert (rf_type == RF_COMPLEX);
470 callback = rf->rf_callback;
471 status = (*callback) (&rf->rf_udata);
472 }
474 plugin_set_ctx (old_ctx);
476 /* If the function signals failure, we will increase the
477 * intervals in which it will be called. */
478 if (status != 0)
479 {
480 rf->rf_effective_interval *= 2;
481 if (rf->rf_effective_interval > TIME_T_TO_CDTIME_T (86400))
482 rf->rf_effective_interval = TIME_T_TO_CDTIME_T (86400);
484 NOTICE ("read-function of plugin `%s' failed. "
485 "Will suspend it for %.3f seconds.",
486 rf->rf_name,
487 CDTIME_T_TO_DOUBLE (rf->rf_effective_interval));
488 }
489 else
490 {
491 /* Success: Restore the interval, if it was changed. */
492 rf->rf_effective_interval = rf->rf_interval;
493 }
495 /* update the ``next read due'' field */
496 now = cdtime ();
498 DEBUG ("plugin_read_thread: Effective interval of the "
499 "%s plugin is %.3f seconds.",
500 rf->rf_name,
501 CDTIME_T_TO_DOUBLE (rf->rf_effective_interval));
503 /* Calculate the next (absolute) time at which this function
504 * should be called. */
505 rf->rf_next_read += rf->rf_effective_interval;
507 /* Check, if `rf_next_read' is in the past. */
508 if (rf->rf_next_read < now)
509 {
510 /* `rf_next_read' is in the past. Insert `now'
511 * so this value doesn't trail off into the
512 * past too much. */
513 rf->rf_next_read = now;
514 }
516 DEBUG ("plugin_read_thread: Next read of the %s plugin at %.3f.",
517 rf->rf_name,
518 CDTIME_T_TO_DOUBLE (rf->rf_next_read));
520 /* Re-insert this read function into the heap again. */
521 c_heap_insert (read_heap, rf);
522 } /* while (read_loop) */
524 pthread_exit (NULL);
525 return ((void *) 0);
526 } /* void *plugin_read_thread */
528 static void start_read_threads (int num)
529 {
530 int i;
532 if (read_threads != NULL)
533 return;
535 read_threads = (pthread_t *) calloc (num, sizeof (pthread_t));
536 if (read_threads == NULL)
537 {
538 ERROR ("plugin: start_read_threads: calloc failed.");
539 return;
540 }
542 read_threads_num = 0;
543 for (i = 0; i < num; i++)
544 {
545 if (pthread_create (read_threads + read_threads_num, NULL,
546 plugin_read_thread, NULL) == 0)
547 {
548 read_threads_num++;
549 }
550 else
551 {
552 ERROR ("plugin: start_read_threads: pthread_create failed.");
553 return;
554 }
555 } /* for (i) */
556 } /* void start_read_threads */
558 static void stop_read_threads (void)
559 {
560 int i;
562 if (read_threads == NULL)
563 return;
565 INFO ("collectd: Stopping %i read threads.", read_threads_num);
567 pthread_mutex_lock (&read_lock);
568 read_loop = 0;
569 DEBUG ("plugin: stop_read_threads: Signalling `read_cond'");
570 pthread_cond_broadcast (&read_cond);
571 pthread_mutex_unlock (&read_lock);
573 for (i = 0; i < read_threads_num; i++)
574 {
575 if (pthread_join (read_threads[i], NULL) != 0)
576 {
577 ERROR ("plugin: stop_read_threads: pthread_join failed.");
578 }
579 read_threads[i] = (pthread_t) 0;
580 }
581 sfree (read_threads);
582 read_threads_num = 0;
583 } /* void stop_read_threads */
585 static void plugin_value_list_free (value_list_t *vl) /* {{{ */
586 {
587 if (vl == NULL)
588 return;
590 meta_data_destroy (vl->meta);
591 sfree (vl->values);
592 sfree (vl);
593 } /* }}} void plugin_value_list_free */
595 static value_list_t *plugin_value_list_clone (value_list_t const *vl_orig) /* {{{ */
596 {
597 value_list_t *vl;
599 if (vl_orig == NULL)
600 return (NULL);
602 vl = malloc (sizeof (*vl));
603 if (vl == NULL)
604 return (NULL);
605 memcpy (vl, vl_orig, sizeof (*vl));
607 vl->values = calloc (vl_orig->values_len, sizeof (*vl->values));
608 if (vl->values == NULL)
609 {
610 plugin_value_list_free (vl);
611 return (NULL);
612 }
613 memcpy (vl->values, vl_orig->values,
614 vl_orig->values_len * sizeof (*vl->values));
616 vl->meta = meta_data_clone (vl->meta);
617 if ((vl_orig->meta != NULL) && (vl->meta == NULL))
618 {
619 plugin_value_list_free (vl);
620 return (NULL);
621 }
623 if (vl->time == 0)
624 vl->time = cdtime ();
626 /* Fill in the interval from the thread context, if it is zero. */
627 if (vl->interval == 0)
628 {
629 plugin_ctx_t ctx = plugin_get_ctx ();
631 if (ctx.interval != 0)
632 vl->interval = ctx.interval;
633 else
634 {
635 char name[6 * DATA_MAX_NAME_LEN];
636 FORMAT_VL (name, sizeof (name), vl);
637 ERROR ("plugin_value_list_clone: Unable to determine "
638 "interval from context for "
639 "value list \"%s\". "
640 "This indicates a broken plugin. "
641 "Please report this problem to the "
642 "collectd mailing list or at "
643 "<http://collectd.org/bugs/>.", name);
644 vl->interval = cf_get_default_interval ();
645 }
646 }
648 return (vl);
649 } /* }}} value_list_t *plugin_value_list_clone */
651 static int plugin_write_enqueue (value_list_t const *vl) /* {{{ */
652 {
653 write_queue_t *q;
655 q = malloc (sizeof (*q));
656 if (q == NULL)
657 return (ENOMEM);
658 q->next = NULL;
660 q->vl = plugin_value_list_clone (vl);
661 if (q->vl == NULL)
662 {
663 sfree (q);
664 return (ENOMEM);
665 }
667 /* Store context of caller (read plugin); otherwise, it would not be
668 * available to the write plugins when actually dispatching the
669 * value-list later on. */
670 q->ctx = plugin_get_ctx ();
672 pthread_mutex_lock (&write_lock);
674 if (write_queue_tail == NULL)
675 {
676 write_queue_head = q;
677 write_queue_tail = q;
678 write_queue_length = 1;
679 }
680 else
681 {
682 write_queue_tail->next = q;
683 write_queue_tail = q;
684 write_queue_length += 1;
685 }
687 pthread_cond_signal (&write_cond);
688 pthread_mutex_unlock (&write_lock);
690 return (0);
691 } /* }}} int plugin_write_enqueue */
693 static value_list_t *plugin_write_dequeue (void) /* {{{ */
694 {
695 write_queue_t *q;
696 value_list_t *vl;
698 pthread_mutex_lock (&write_lock);
700 while (write_loop && (write_queue_head == NULL))
701 pthread_cond_wait (&write_cond, &write_lock);
703 if (write_queue_head == NULL)
704 {
705 pthread_mutex_unlock (&write_lock);
706 return (NULL);
707 }
709 q = write_queue_head;
710 write_queue_head = q->next;
711 write_queue_length -= 1;
712 if (write_queue_head == NULL) {
713 write_queue_tail = NULL;
714 assert(0 == write_queue_length);
715 }
717 pthread_mutex_unlock (&write_lock);
719 (void) plugin_set_ctx (q->ctx);
721 vl = q->vl;
722 sfree (q);
723 return (vl);
724 } /* }}} value_list_t *plugin_write_dequeue */
726 static void *plugin_write_thread (void __attribute__((unused)) *args) /* {{{ */
727 {
728 while (write_loop)
729 {
730 value_list_t *vl = plugin_write_dequeue ();
731 if (vl == NULL)
732 continue;
734 plugin_dispatch_values_internal (vl);
736 plugin_value_list_free (vl);
737 }
739 pthread_exit (NULL);
740 return ((void *) 0);
741 } /* }}} void *plugin_write_thread */
743 static void start_write_threads (size_t num) /* {{{ */
744 {
745 size_t i;
747 if (write_threads != NULL)
748 return;
750 write_threads = (pthread_t *) calloc (num, sizeof (pthread_t));
751 if (write_threads == NULL)
752 {
753 ERROR ("plugin: start_write_threads: calloc failed.");
754 return;
755 }
757 write_threads_num = 0;
758 for (i = 0; i < num; i++)
759 {
760 int status;
762 status = pthread_create (write_threads + write_threads_num,
763 /* attr = */ NULL,
764 plugin_write_thread,
765 /* arg = */ NULL);
766 if (status != 0)
767 {
768 char errbuf[1024];
769 ERROR ("plugin: start_write_threads: pthread_create failed "
770 "with status %i (%s).", status,
771 sstrerror (status, errbuf, sizeof (errbuf)));
772 return;
773 }
775 write_threads_num++;
776 } /* for (i) */
777 } /* }}} void start_write_threads */
779 static void stop_write_threads (void) /* {{{ */
780 {
781 write_queue_t *q;
782 int i;
784 if (write_threads == NULL)
785 return;
787 INFO ("collectd: Stopping %zu write threads.", write_threads_num);
789 pthread_mutex_lock (&write_lock);
790 write_loop = 0;
791 DEBUG ("plugin: stop_write_threads: Signalling `write_cond'");
792 pthread_cond_broadcast (&write_cond);
793 pthread_mutex_unlock (&write_lock);
795 for (i = 0; i < write_threads_num; i++)
796 {
797 if (pthread_join (write_threads[i], NULL) != 0)
798 {
799 ERROR ("plugin: stop_write_threads: pthread_join failed.");
800 }
801 write_threads[i] = (pthread_t) 0;
802 }
803 sfree (write_threads);
804 write_threads_num = 0;
806 pthread_mutex_lock (&write_lock);
807 i = 0;
808 for (q = write_queue_head; q != NULL; )
809 {
810 write_queue_t *q1 = q;
811 plugin_value_list_free (q->vl);
812 q = q->next;
813 sfree (q1);
814 i++;
815 }
816 write_queue_head = NULL;
817 write_queue_tail = NULL;
818 write_queue_length = 0;
819 pthread_mutex_unlock (&write_lock);
821 if (i > 0)
822 {
823 WARNING ("plugin: %i value list%s left after shutting down "
824 "the write threads.",
825 i, (i == 1) ? " was" : "s were");
826 }
827 } /* }}} void stop_write_threads */
829 /*
830 * Public functions
831 */
832 void plugin_set_dir (const char *dir)
833 {
834 if (plugindir != NULL)
835 free (plugindir);
837 if (dir == NULL)
838 plugindir = NULL;
839 else if ((plugindir = strdup (dir)) == NULL)
840 {
841 char errbuf[1024];
842 ERROR ("strdup failed: %s",
843 sstrerror (errno, errbuf, sizeof (errbuf)));
844 }
845 }
847 static _Bool plugin_is_loaded (char const *name)
848 {
849 int status;
851 if (plugins_loaded == NULL)
852 plugins_loaded = c_avl_create ((void *) strcasecmp);
853 assert (plugins_loaded != NULL);
855 status = c_avl_get (plugins_loaded, name, /* ret_value = */ NULL);
856 return (status == 0);
857 }
859 static int plugin_mark_loaded (char const *name)
860 {
861 char *name_copy;
862 int status;
864 name_copy = strdup (name);
865 if (name_copy == NULL)
866 return (ENOMEM);
868 status = c_avl_insert (plugins_loaded,
869 /* key = */ name_copy, /* value = */ NULL);
870 return (status);
871 }
873 static void plugin_free_loaded ()
874 {
875 void *key;
876 void *value;
878 if (plugins_loaded == NULL)
879 return;
881 while (c_avl_pick (plugins_loaded, &key, &value) == 0)
882 {
883 sfree (key);
884 assert (value == NULL);
885 }
887 c_avl_destroy (plugins_loaded);
888 plugins_loaded = NULL;
889 }
891 #define BUFSIZE 512
892 int plugin_load (char const *plugin_name, uint32_t flags)
893 {
894 DIR *dh;
895 const char *dir;
896 char filename[BUFSIZE] = "";
897 char typename[BUFSIZE];
898 int ret;
899 struct stat statbuf;
900 struct dirent *de;
901 int status;
903 if (plugin_name == NULL)
904 return (EINVAL);
906 /* Check if plugin is already loaded and don't do anything in this
907 * case. */
908 if (plugin_is_loaded (plugin_name))
909 return (0);
911 dir = plugin_get_dir ();
912 ret = 1;
914 /*
915 * XXX: Magic at work:
916 *
917 * Some of the language bindings, for example the Python and Perl
918 * plugins, need to be able to export symbols to the scripts they run.
919 * For this to happen, the "Globals" flag needs to be set.
920 * Unfortunately, this technical detail is hard to explain to the
921 * average user and she shouldn't have to worry about this, ideally.
922 * So in order to save everyone's sanity use a different default for a
923 * handful of special plugins. --octo
924 */
925 if ((strcasecmp ("perl", plugin_name) == 0)
926 || (strcasecmp ("python", plugin_name) == 0))
927 flags |= PLUGIN_FLAGS_GLOBAL;
929 /* `cpu' should not match `cpufreq'. To solve this we add `.so' to the
930 * type when matching the filename */
931 status = ssnprintf (typename, sizeof (typename), "%s.so", plugin_name);
932 if ((status < 0) || ((size_t) status >= sizeof (typename)))
933 {
934 WARNING ("plugin_load: Filename too long: \"%s.so\"", plugin_name);
935 return (-1);
936 }
938 if ((dh = opendir (dir)) == NULL)
939 {
940 char errbuf[1024];
941 ERROR ("plugin_load: opendir (%s) failed: %s", dir,
942 sstrerror (errno, errbuf, sizeof (errbuf)));
943 return (-1);
944 }
946 while ((de = readdir (dh)) != NULL)
947 {
948 if (strcasecmp (de->d_name, typename))
949 continue;
951 status = ssnprintf (filename, sizeof (filename),
952 "%s/%s", dir, de->d_name);
953 if ((status < 0) || ((size_t) status >= sizeof (filename)))
954 {
955 WARNING ("plugin_load: Filename too long: \"%s/%s\"",
956 dir, de->d_name);
957 continue;
958 }
960 if (lstat (filename, &statbuf) == -1)
961 {
962 char errbuf[1024];
963 WARNING ("plugin_load: stat (\"%s\") failed: %s",
964 filename,
965 sstrerror (errno, errbuf, sizeof (errbuf)));
966 continue;
967 }
968 else if (!S_ISREG (statbuf.st_mode))
969 {
970 /* don't follow symlinks */
971 WARNING ("plugin_load: %s is not a regular file.",
972 filename);
973 continue;
974 }
976 status = plugin_load_file (filename, flags);
977 if (status == 0)
978 {
979 /* success */
980 plugin_mark_loaded (plugin_name);
981 ret = 0;
982 break;
983 }
984 else
985 {
986 ERROR ("plugin_load: Load plugin \"%s\" failed with "
987 "status %i.", plugin_name, status);
988 }
989 }
991 closedir (dh);
993 if (filename[0] == 0)
994 ERROR ("plugin_load: Could not find plugin \"%s\" in %s",
995 plugin_name, dir);
997 return (ret);
998 }
1000 /*
1001 * The `register_*' functions follow
1002 */
1003 int plugin_register_config (const char *name,
1004 int (*callback) (const char *key, const char *val),
1005 const char **keys, int keys_num)
1006 {
1007 cf_register (name, callback, keys, keys_num);
1008 return (0);
1009 } /* int plugin_register_config */
1011 int plugin_register_complex_config (const char *type,
1012 int (*callback) (oconfig_item_t *))
1013 {
1014 return (cf_register_complex (type, callback));
1015 } /* int plugin_register_complex_config */
1017 int plugin_register_init (const char *name,
1018 int (*callback) (void))
1019 {
1020 return (create_register_callback (&list_init, name, (void *) callback,
1021 /* user_data = */ NULL));
1022 } /* plugin_register_init */
1024 static int plugin_compare_read_func (const void *arg0, const void *arg1)
1025 {
1026 const read_func_t *rf0;
1027 const read_func_t *rf1;
1029 rf0 = arg0;
1030 rf1 = arg1;
1032 if (rf0->rf_next_read < rf1->rf_next_read)
1033 return (-1);
1034 else if (rf0->rf_next_read > rf1->rf_next_read)
1035 return (1);
1036 else
1037 return (0);
1038 } /* int plugin_compare_read_func */
1040 /* Add a read function to both, the heap and a linked list. The linked list if
1041 * used to look-up read functions, especially for the remove function. The heap
1042 * is used to determine which plugin to read next. */
1043 static int plugin_insert_read (read_func_t *rf)
1044 {
1045 int status;
1046 llentry_t *le;
1048 rf->rf_next_read = cdtime ();
1049 rf->rf_effective_interval = rf->rf_interval;
1051 pthread_mutex_lock (&read_lock);
1053 if (read_list == NULL)
1054 {
1055 read_list = llist_create ();
1056 if (read_list == NULL)
1057 {
1058 pthread_mutex_unlock (&read_lock);
1059 ERROR ("plugin_insert_read: read_list failed.");
1060 return (-1);
1061 }
1062 }
1064 if (read_heap == NULL)
1065 {
1066 read_heap = c_heap_create (plugin_compare_read_func);
1067 if (read_heap == NULL)
1068 {
1069 pthread_mutex_unlock (&read_lock);
1070 ERROR ("plugin_insert_read: c_heap_create failed.");
1071 return (-1);
1072 }
1073 }
1075 le = llist_search (read_list, rf->rf_name);
1076 if (le != NULL)
1077 {
1078 pthread_mutex_unlock (&read_lock);
1079 WARNING ("The read function \"%s\" is already registered. "
1080 "Check for duplicate \"LoadPlugin\" lines "
1081 "in your configuration!",
1082 rf->rf_name);
1083 return (EINVAL);
1084 }
1086 le = llentry_create (rf->rf_name, rf);
1087 if (le == NULL)
1088 {
1089 pthread_mutex_unlock (&read_lock);
1090 ERROR ("plugin_insert_read: llentry_create failed.");
1091 return (-1);
1092 }
1094 status = c_heap_insert (read_heap, rf);
1095 if (status != 0)
1096 {
1097 pthread_mutex_unlock (&read_lock);
1098 ERROR ("plugin_insert_read: c_heap_insert failed.");
1099 llentry_destroy (le);
1100 return (-1);
1101 }
1103 /* This does not fail. */
1104 llist_append (read_list, le);
1106 /* Wake up all the read threads. */
1107 pthread_cond_broadcast (&read_cond);
1108 pthread_mutex_unlock (&read_lock);
1109 return (0);
1110 } /* int plugin_insert_read */
1112 int plugin_register_read (const char *name,
1113 int (*callback) (void))
1114 {
1115 read_func_t *rf;
1116 int status;
1118 rf = malloc (sizeof (*rf));
1119 if (rf == NULL)
1120 {
1121 ERROR ("plugin_register_read: malloc failed.");
1122 return (ENOMEM);
1123 }
1125 memset (rf, 0, sizeof (read_func_t));
1126 rf->rf_callback = (void *) callback;
1127 rf->rf_udata.data = NULL;
1128 rf->rf_udata.free_func = NULL;
1129 rf->rf_ctx = plugin_get_ctx ();
1130 rf->rf_group[0] = '\0';
1131 rf->rf_name = strdup (name);
1132 rf->rf_type = RF_SIMPLE;
1133 rf->rf_interval = plugin_get_interval ();
1135 status = plugin_insert_read (rf);
1136 if (status != 0) {
1137 sfree (rf->rf_name);
1138 sfree (rf);
1139 }
1141 return (status);
1142 } /* int plugin_register_read */
1144 int plugin_register_complex_read (const char *group, const char *name,
1145 plugin_read_cb callback,
1146 const struct timespec *interval,
1147 user_data_t *user_data)
1148 {
1149 read_func_t *rf;
1150 int status;
1152 rf = malloc (sizeof (*rf));
1153 if (rf == NULL)
1154 {
1155 ERROR ("plugin_register_complex_read: malloc failed.");
1156 return (ENOMEM);
1157 }
1159 memset (rf, 0, sizeof (read_func_t));
1160 rf->rf_callback = (void *) callback;
1161 if (group != NULL)
1162 sstrncpy (rf->rf_group, group, sizeof (rf->rf_group));
1163 else
1164 rf->rf_group[0] = '\0';
1165 rf->rf_name = strdup (name);
1166 rf->rf_type = RF_COMPLEX;
1167 if (interval != NULL)
1168 rf->rf_interval = TIMESPEC_TO_CDTIME_T (interval);
1169 else
1170 rf->rf_interval = plugin_get_interval ();
1172 /* Set user data */
1173 if (user_data == NULL)
1174 {
1175 rf->rf_udata.data = NULL;
1176 rf->rf_udata.free_func = NULL;
1177 }
1178 else
1179 {
1180 rf->rf_udata = *user_data;
1181 }
1183 rf->rf_ctx = plugin_get_ctx ();
1185 status = plugin_insert_read (rf);
1186 if (status != 0) {
1187 sfree (rf->rf_name);
1188 sfree (rf);
1189 }
1191 return (status);
1192 } /* int plugin_register_complex_read */
1194 int plugin_register_write (const char *name,
1195 plugin_write_cb callback, user_data_t *ud)
1196 {
1197 return (create_register_callback (&list_write, name,
1198 (void *) callback, ud));
1199 } /* int plugin_register_write */
1201 int plugin_register_flush (const char *name,
1202 plugin_flush_cb callback, user_data_t *ud)
1203 {
1204 return (create_register_callback (&list_flush, name,
1205 (void *) callback, ud));
1206 } /* int plugin_register_flush */
1208 int plugin_register_missing (const char *name,
1209 plugin_missing_cb callback, user_data_t *ud)
1210 {
1211 return (create_register_callback (&list_missing, name,
1212 (void *) callback, ud));
1213 } /* int plugin_register_missing */
1215 int plugin_register_shutdown (const char *name,
1216 int (*callback) (void))
1217 {
1218 return (create_register_callback (&list_shutdown, name,
1219 (void *) callback, /* user_data = */ NULL));
1220 } /* int plugin_register_shutdown */
1222 static void plugin_free_data_sets (void)
1223 {
1224 void *key;
1225 void *value;
1227 if (data_sets == NULL)
1228 return;
1230 while (c_avl_pick (data_sets, &key, &value) == 0)
1231 {
1232 data_set_t *ds = value;
1233 /* key is a pointer to ds->type */
1235 sfree (ds->ds);
1236 sfree (ds);
1237 }
1239 c_avl_destroy (data_sets);
1240 data_sets = NULL;
1241 } /* void plugin_free_data_sets */
1243 int plugin_register_data_set (const data_set_t *ds)
1244 {
1245 data_set_t *ds_copy;
1246 int i;
1248 if ((data_sets != NULL)
1249 && (c_avl_get (data_sets, ds->type, NULL) == 0))
1250 {
1251 NOTICE ("Replacing DS `%s' with another version.", ds->type);
1252 plugin_unregister_data_set (ds->type);
1253 }
1254 else if (data_sets == NULL)
1255 {
1256 data_sets = c_avl_create ((int (*) (const void *, const void *)) strcmp);
1257 if (data_sets == NULL)
1258 return (-1);
1259 }
1261 ds_copy = (data_set_t *) malloc (sizeof (data_set_t));
1262 if (ds_copy == NULL)
1263 return (-1);
1264 memcpy(ds_copy, ds, sizeof (data_set_t));
1266 ds_copy->ds = (data_source_t *) malloc (sizeof (data_source_t)
1267 * ds->ds_num);
1268 if (ds_copy->ds == NULL)
1269 {
1270 free (ds_copy);
1271 return (-1);
1272 }
1274 for (i = 0; i < ds->ds_num; i++)
1275 memcpy (ds_copy->ds + i, ds->ds + i, sizeof (data_source_t));
1277 return (c_avl_insert (data_sets, (void *) ds_copy->type, (void *) ds_copy));
1278 } /* int plugin_register_data_set */
1280 int plugin_register_log (const char *name,
1281 plugin_log_cb callback, user_data_t *ud)
1282 {
1283 return (create_register_callback (&list_log, name,
1284 (void *) callback, ud));
1285 } /* int plugin_register_log */
1287 int plugin_register_notification (const char *name,
1288 plugin_notification_cb callback, user_data_t *ud)
1289 {
1290 return (create_register_callback (&list_notification, name,
1291 (void *) callback, ud));
1292 } /* int plugin_register_log */
1294 int plugin_unregister_config (const char *name)
1295 {
1296 cf_unregister (name);
1297 return (0);
1298 } /* int plugin_unregister_config */
1300 int plugin_unregister_complex_config (const char *name)
1301 {
1302 cf_unregister_complex (name);
1303 return (0);
1304 } /* int plugin_unregister_complex_config */
1306 int plugin_unregister_init (const char *name)
1307 {
1308 return (plugin_unregister (list_init, name));
1309 }
1311 int plugin_unregister_read (const char *name) /* {{{ */
1312 {
1313 llentry_t *le;
1314 read_func_t *rf;
1316 if (name == NULL)
1317 return (-ENOENT);
1319 pthread_mutex_lock (&read_lock);
1321 if (read_list == NULL)
1322 {
1323 pthread_mutex_unlock (&read_lock);
1324 return (-ENOENT);
1325 }
1327 le = llist_search (read_list, name);
1328 if (le == NULL)
1329 {
1330 pthread_mutex_unlock (&read_lock);
1331 WARNING ("plugin_unregister_read: No such read function: %s",
1332 name);
1333 return (-ENOENT);
1334 }
1336 llist_remove (read_list, le);
1338 rf = le->value;
1339 assert (rf != NULL);
1340 rf->rf_type = RF_REMOVE;
1342 pthread_mutex_unlock (&read_lock);
1344 llentry_destroy (le);
1346 DEBUG ("plugin_unregister_read: Marked `%s' for removal.", name);
1348 return (0);
1349 } /* }}} int plugin_unregister_read */
1351 static int compare_read_func_group (llentry_t *e, void *ud) /* {{{ */
1352 {
1353 read_func_t *rf = e->value;
1354 char *group = ud;
1356 return strcmp (rf->rf_group, (const char *)group);
1357 } /* }}} int compare_read_func_group */
1359 int plugin_unregister_read_group (const char *group) /* {{{ */
1360 {
1361 llentry_t *le;
1362 read_func_t *rf;
1364 int found = 0;
1366 if (group == NULL)
1367 return (-ENOENT);
1369 pthread_mutex_lock (&read_lock);
1371 if (read_list == NULL)
1372 {
1373 pthread_mutex_unlock (&read_lock);
1374 return (-ENOENT);
1375 }
1377 while (42)
1378 {
1379 le = llist_search_custom (read_list,
1380 compare_read_func_group, (void *)group);
1382 if (le == NULL)
1383 break;
1385 ++found;
1387 llist_remove (read_list, le);
1389 rf = le->value;
1390 assert (rf != NULL);
1391 rf->rf_type = RF_REMOVE;
1393 llentry_destroy (le);
1395 DEBUG ("plugin_unregister_read_group: "
1396 "Marked `%s' (group `%s') for removal.",
1397 rf->rf_name, group);
1398 }
1400 pthread_mutex_unlock (&read_lock);
1402 if (found == 0)
1403 {
1404 WARNING ("plugin_unregister_read_group: No such "
1405 "group of read function: %s", group);
1406 return (-ENOENT);
1407 }
1409 return (0);
1410 } /* }}} int plugin_unregister_read_group */
1412 int plugin_unregister_write (const char *name)
1413 {
1414 return (plugin_unregister (list_write, name));
1415 }
1417 int plugin_unregister_flush (const char *name)
1418 {
1419 return (plugin_unregister (list_flush, name));
1420 }
1422 int plugin_unregister_missing (const char *name)
1423 {
1424 return (plugin_unregister (list_missing, name));
1425 }
1427 int plugin_unregister_shutdown (const char *name)
1428 {
1429 return (plugin_unregister (list_shutdown, name));
1430 }
1432 int plugin_unregister_data_set (const char *name)
1433 {
1434 data_set_t *ds;
1436 if (data_sets == NULL)
1437 return (-1);
1439 if (c_avl_remove (data_sets, name, NULL, (void *) &ds) != 0)
1440 return (-1);
1442 sfree (ds->ds);
1443 sfree (ds);
1445 return (0);
1446 } /* int plugin_unregister_data_set */
1448 int plugin_unregister_log (const char *name)
1449 {
1450 return (plugin_unregister (list_log, name));
1451 }
1453 int plugin_unregister_notification (const char *name)
1454 {
1455 return (plugin_unregister (list_notification, name));
1456 }
1458 void plugin_init_all (void)
1459 {
1460 char const *chain_name;
1461 llentry_t *le;
1462 int status;
1464 /* Init the value cache */
1465 uc_init ();
1467 chain_name = global_option_get ("PreCacheChain");
1468 pre_cache_chain = fc_chain_get_by_name (chain_name);
1470 chain_name = global_option_get ("PostCacheChain");
1471 post_cache_chain = fc_chain_get_by_name (chain_name);
1473 write_limit_high = global_option_get_long ("WriteQueueLimitHigh",
1474 /* default = */ 0);
1475 if (write_limit_high < 0)
1476 {
1477 ERROR ("WriteQueueLimitHigh must be positive or zero.");
1478 write_limit_high = 0;
1479 }
1481 write_limit_low = global_option_get_long ("WriteQueueLimitLow",
1482 /* default = */ write_limit_high / 2);
1483 if (write_limit_low < 0)
1484 {
1485 ERROR ("WriteQueueLimitLow must be positive or zero.");
1486 write_limit_low = write_limit_high / 2;
1487 }
1488 else if (write_limit_low > write_limit_high)
1489 {
1490 ERROR ("WriteQueueLimitLow must not be larger than "
1491 "WriteQueueLimitHigh.");
1492 write_limit_low = write_limit_high;
1493 }
1495 write_threads_num = global_option_get_long ("WriteThreads",
1496 /* default = */ 5);
1497 if (write_threads_num < 1)
1498 {
1499 ERROR ("WriteThreads must be positive.");
1500 write_threads_num = 5;
1501 }
1503 if ((list_init == NULL) && (read_heap == NULL))
1504 return;
1506 /* Calling all init callbacks before checking if read callbacks
1507 * are available allows the init callbacks to register the read
1508 * callback. */
1509 le = llist_head (list_init);
1510 while (le != NULL)
1511 {
1512 callback_func_t *cf;
1513 plugin_init_cb callback;
1514 plugin_ctx_t old_ctx;
1516 cf = le->value;
1517 old_ctx = plugin_set_ctx (cf->cf_ctx);
1518 callback = cf->cf_callback;
1519 status = (*callback) ();
1520 plugin_set_ctx (old_ctx);
1522 if (status != 0)
1523 {
1524 ERROR ("Initialization of plugin `%s' "
1525 "failed with status %i. "
1526 "Plugin will be unloaded.",
1527 le->key, status);
1528 /* Plugins that register read callbacks from the init
1529 * callback should take care of appropriate error
1530 * handling themselves. */
1531 /* FIXME: Unload _all_ functions */
1532 plugin_unregister_read (le->key);
1533 }
1535 le = le->next;
1536 }
1538 start_write_threads ((size_t) write_threads_num);
1540 /* Start read-threads */
1541 if (read_heap != NULL)
1542 {
1543 const char *rt;
1544 int num;
1545 rt = global_option_get ("ReadThreads");
1546 num = atoi (rt);
1547 if (num != -1)
1548 start_read_threads ((num > 0) ? num : 5);
1549 }
1550 } /* void plugin_init_all */
1552 /* TODO: Rename this function. */
1553 void plugin_read_all (void)
1554 {
1555 uc_check_timeout ();
1557 return;
1558 } /* void plugin_read_all */
1560 /* Read function called when the `-T' command line argument is given. */
1561 int plugin_read_all_once (void)
1562 {
1563 int status;
1564 int return_status = 0;
1566 if (read_heap == NULL)
1567 {
1568 NOTICE ("No read-functions are registered.");
1569 return (0);
1570 }
1572 while (42)
1573 {
1574 read_func_t *rf;
1575 plugin_ctx_t old_ctx;
1577 rf = c_heap_get_root (read_heap);
1578 if (rf == NULL)
1579 break;
1581 old_ctx = plugin_set_ctx (rf->rf_ctx);
1583 if (rf->rf_type == RF_SIMPLE)
1584 {
1585 int (*callback) (void);
1587 callback = rf->rf_callback;
1588 status = (*callback) ();
1589 }
1590 else
1591 {
1592 plugin_read_cb callback;
1594 callback = rf->rf_callback;
1595 status = (*callback) (&rf->rf_udata);
1596 }
1598 plugin_set_ctx (old_ctx);
1600 if (status != 0)
1601 {
1602 NOTICE ("read-function of plugin `%s' failed.",
1603 rf->rf_name);
1604 return_status = -1;
1605 }
1607 sfree (rf->rf_name);
1608 destroy_callback ((void *) rf);
1609 }
1611 return (return_status);
1612 } /* int plugin_read_all_once */
1614 int plugin_write (const char *plugin, /* {{{ */
1615 const data_set_t *ds, const value_list_t *vl)
1616 {
1617 llentry_t *le;
1618 int status;
1620 if (vl == NULL)
1621 return (EINVAL);
1623 if (list_write == NULL)
1624 return (ENOENT);
1626 if (ds == NULL)
1627 {
1628 ds = plugin_get_ds (vl->type);
1629 if (ds == NULL)
1630 {
1631 ERROR ("plugin_write: Unable to lookup type `%s'.", vl->type);
1632 return (ENOENT);
1633 }
1634 }
1636 if (plugin == NULL)
1637 {
1638 int success = 0;
1639 int failure = 0;
1641 le = llist_head (list_write);
1642 while (le != NULL)
1643 {
1644 callback_func_t *cf = le->value;
1645 plugin_write_cb callback;
1647 /* do not switch plugin context; rather keep the context (interval)
1648 * information of the calling read plugin */
1650 DEBUG ("plugin: plugin_write: Writing values via %s.", le->key);
1651 callback = cf->cf_callback;
1652 status = (*callback) (ds, vl, &cf->cf_udata);
1653 if (status != 0)
1654 failure++;
1655 else
1656 success++;
1658 le = le->next;
1659 }
1661 if ((success == 0) && (failure != 0))
1662 status = -1;
1663 else
1664 status = 0;
1665 }
1666 else /* plugin != NULL */
1667 {
1668 callback_func_t *cf;
1669 plugin_write_cb callback;
1671 le = llist_head (list_write);
1672 while (le != NULL)
1673 {
1674 if (strcasecmp (plugin, le->key) == 0)
1675 break;
1677 le = le->next;
1678 }
1680 if (le == NULL)
1681 return (ENOENT);
1683 cf = le->value;
1685 /* do not switch plugin context; rather keep the context (interval)
1686 * information of the calling read plugin */
1688 DEBUG ("plugin: plugin_write: Writing values via %s.", le->key);
1689 callback = cf->cf_callback;
1690 status = (*callback) (ds, vl, &cf->cf_udata);
1691 }
1693 return (status);
1694 } /* }}} int plugin_write */
1696 int plugin_flush (const char *plugin, cdtime_t timeout, const char *identifier)
1697 {
1698 llentry_t *le;
1700 if (list_flush == NULL)
1701 return (0);
1703 le = llist_head (list_flush);
1704 while (le != NULL)
1705 {
1706 callback_func_t *cf;
1707 plugin_flush_cb callback;
1708 plugin_ctx_t old_ctx;
1710 if ((plugin != NULL)
1711 && (strcmp (plugin, le->key) != 0))
1712 {
1713 le = le->next;
1714 continue;
1715 }
1717 cf = le->value;
1718 old_ctx = plugin_set_ctx (cf->cf_ctx);
1719 callback = cf->cf_callback;
1721 (*callback) (timeout, identifier, &cf->cf_udata);
1723 plugin_set_ctx (old_ctx);
1725 le = le->next;
1726 }
1727 return (0);
1728 } /* int plugin_flush */
1730 void plugin_shutdown_all (void)
1731 {
1732 llentry_t *le;
1734 stop_read_threads ();
1736 destroy_all_callbacks (&list_init);
1738 pthread_mutex_lock (&read_lock);
1739 llist_destroy (read_list);
1740 read_list = NULL;
1741 pthread_mutex_unlock (&read_lock);
1743 destroy_read_heap ();
1745 plugin_flush (/* plugin = */ NULL,
1746 /* timeout = */ 0,
1747 /* identifier = */ NULL);
1749 le = NULL;
1750 if (list_shutdown != NULL)
1751 le = llist_head (list_shutdown);
1753 while (le != NULL)
1754 {
1755 callback_func_t *cf;
1756 plugin_shutdown_cb callback;
1757 plugin_ctx_t old_ctx;
1759 cf = le->value;
1760 old_ctx = plugin_set_ctx (cf->cf_ctx);
1761 callback = cf->cf_callback;
1763 /* Advance the pointer before calling the callback allows
1764 * shutdown functions to unregister themselves. If done the
1765 * other way around the memory `le' points to will be freed
1766 * after callback returns. */
1767 le = le->next;
1769 (*callback) ();
1771 plugin_set_ctx (old_ctx);
1772 }
1774 stop_write_threads ();
1776 /* Write plugins which use the `user_data' pointer usually need the
1777 * same data available to the flush callback. If this is the case, set
1778 * the free_function to NULL when registering the flush callback and to
1779 * the real free function when registering the write callback. This way
1780 * the data isn't freed twice. */
1781 destroy_all_callbacks (&list_flush);
1782 destroy_all_callbacks (&list_missing);
1783 destroy_all_callbacks (&list_write);
1785 destroy_all_callbacks (&list_notification);
1786 destroy_all_callbacks (&list_shutdown);
1787 destroy_all_callbacks (&list_log);
1789 plugin_free_loaded ();
1790 plugin_free_data_sets ();
1791 } /* void plugin_shutdown_all */
1793 int plugin_dispatch_missing (const value_list_t *vl) /* {{{ */
1794 {
1795 llentry_t *le;
1797 if (list_missing == NULL)
1798 return (0);
1800 le = llist_head (list_missing);
1801 while (le != NULL)
1802 {
1803 callback_func_t *cf;
1804 plugin_missing_cb callback;
1805 plugin_ctx_t old_ctx;
1806 int status;
1808 cf = le->value;
1809 old_ctx = plugin_set_ctx (cf->cf_ctx);
1810 callback = cf->cf_callback;
1812 status = (*callback) (vl, &cf->cf_udata);
1813 plugin_set_ctx (old_ctx);
1814 if (status != 0)
1815 {
1816 if (status < 0)
1817 {
1818 ERROR ("plugin_dispatch_missing: Callback function \"%s\" "
1819 "failed with status %i.",
1820 le->key, status);
1821 return (status);
1822 }
1823 else
1824 {
1825 return (0);
1826 }
1827 }
1829 le = le->next;
1830 }
1831 return (0);
1832 } /* int }}} plugin_dispatch_missing */
1834 static int plugin_dispatch_values_internal (value_list_t *vl)
1835 {
1836 int status;
1837 static c_complain_t no_write_complaint = C_COMPLAIN_INIT_STATIC;
1839 value_t *saved_values;
1840 int saved_values_len;
1842 data_set_t *ds;
1844 int free_meta_data = 0;
1846 if ((vl == NULL) || (vl->type[0] == 0)
1847 || (vl->values == NULL) || (vl->values_len < 1))
1848 {
1849 ERROR ("plugin_dispatch_values: Invalid value list "
1850 "from plugin %s.", vl->plugin);
1851 return (-1);
1852 }
1854 /* Free meta data only if the calling function didn't specify any. In
1855 * this case matches and targets may add some and the calling function
1856 * may not expect (and therefore free) that data. */
1857 if (vl->meta == NULL)
1858 free_meta_data = 1;
1860 if (list_write == NULL)
1861 c_complain_once (LOG_WARNING, &no_write_complaint,
1862 "plugin_dispatch_values: No write callback has been "
1863 "registered. Please load at least one output plugin, "
1864 "if you want the collected data to be stored.");
1866 if (data_sets == NULL)
1867 {
1868 ERROR ("plugin_dispatch_values: No data sets registered. "
1869 "Could the types database be read? Check "
1870 "your `TypesDB' setting!");
1871 return (-1);
1872 }
1874 if (c_avl_get (data_sets, vl->type, (void *) &ds) != 0)
1875 {
1876 char ident[6 * DATA_MAX_NAME_LEN];
1878 FORMAT_VL (ident, sizeof (ident), vl);
1879 INFO ("plugin_dispatch_values: Dataset not found: %s "
1880 "(from \"%s\"), check your types.db!",
1881 vl->type, ident);
1882 return (-1);
1883 }
1885 /* Assured by plugin_value_list_clone(). The time is determined at
1886 * _enqueue_ time. */
1887 assert (vl->time != 0);
1888 assert (vl->interval != 0);
1890 DEBUG ("plugin_dispatch_values: time = %.3f; interval = %.3f; "
1891 "host = %s; "
1892 "plugin = %s; plugin_instance = %s; "
1893 "type = %s; type_instance = %s;",
1894 CDTIME_T_TO_DOUBLE (vl->time),
1895 CDTIME_T_TO_DOUBLE (vl->interval),
1896 vl->host,
1897 vl->plugin, vl->plugin_instance,
1898 vl->type, vl->type_instance);
1900 #if COLLECT_DEBUG
1901 assert (0 == strcmp (ds->type, vl->type));
1902 #else
1903 if (0 != strcmp (ds->type, vl->type))
1904 WARNING ("plugin_dispatch_values: (ds->type = %s) != (vl->type = %s)",
1905 ds->type, vl->type);
1906 #endif
1908 #if COLLECT_DEBUG
1909 assert (ds->ds_num == vl->values_len);
1910 #else
1911 if (ds->ds_num != vl->values_len)
1912 {
1913 ERROR ("plugin_dispatch_values: ds->type = %s: "
1914 "(ds->ds_num = %i) != "
1915 "(vl->values_len = %i)",
1916 ds->type, ds->ds_num, vl->values_len);
1917 return (-1);
1918 }
1919 #endif
1921 escape_slashes (vl->host, sizeof (vl->host));
1922 escape_slashes (vl->plugin, sizeof (vl->plugin));
1923 escape_slashes (vl->plugin_instance, sizeof (vl->plugin_instance));
1924 escape_slashes (vl->type, sizeof (vl->type));
1925 escape_slashes (vl->type_instance, sizeof (vl->type_instance));
1927 /* Copy the values. This way, we can assure `targets' that they get
1928 * dynamically allocated values, which they can free and replace if
1929 * they like. */
1930 if ((pre_cache_chain != NULL) || (post_cache_chain != NULL))
1931 {
1932 saved_values = vl->values;
1933 saved_values_len = vl->values_len;
1935 vl->values = (value_t *) calloc (vl->values_len,
1936 sizeof (*vl->values));
1937 if (vl->values == NULL)
1938 {
1939 ERROR ("plugin_dispatch_values: calloc failed.");
1940 vl->values = saved_values;
1941 return (-1);
1942 }
1943 memcpy (vl->values, saved_values,
1944 vl->values_len * sizeof (*vl->values));
1945 }
1946 else /* if ((pre == NULL) && (post == NULL)) */
1947 {
1948 saved_values = NULL;
1949 saved_values_len = 0;
1950 }
1952 if (pre_cache_chain != NULL)
1953 {
1954 status = fc_process_chain (ds, vl, pre_cache_chain);
1955 if (status < 0)
1956 {
1957 WARNING ("plugin_dispatch_values: Running the "
1958 "pre-cache chain failed with "
1959 "status %i (%#x).",
1960 status, status);
1961 }
1962 else if (status == FC_TARGET_STOP)
1963 {
1964 /* Restore the state of the value_list so that plugins
1965 * don't get confused.. */
1966 if (saved_values != NULL)
1967 {
1968 free (vl->values);
1969 vl->values = saved_values;
1970 vl->values_len = saved_values_len;
1971 }
1972 return (0);
1973 }
1974 }
1976 /* Update the value cache */
1977 uc_update (ds, vl);
1979 if (post_cache_chain != NULL)
1980 {
1981 status = fc_process_chain (ds, vl, post_cache_chain);
1982 if (status < 0)
1983 {
1984 WARNING ("plugin_dispatch_values: Running the "
1985 "post-cache chain failed with "
1986 "status %i (%#x).",
1987 status, status);
1988 }
1989 }
1990 else
1991 fc_default_action (ds, vl);
1993 /* Restore the state of the value_list so that plugins don't get
1994 * confused.. */
1995 if (saved_values != NULL)
1996 {
1997 free (vl->values);
1998 vl->values = saved_values;
1999 vl->values_len = saved_values_len;
2000 }
2002 if ((free_meta_data != 0) && (vl->meta != NULL))
2003 {
2004 meta_data_destroy (vl->meta);
2005 vl->meta = NULL;
2006 }
2008 return (0);
2009 } /* int plugin_dispatch_values_internal */
2011 static double get_drop_probability (void) /* {{{ */
2012 {
2013 long pos;
2014 long size;
2015 long wql;
2017 pthread_mutex_lock (&write_lock);
2018 wql = write_queue_length;
2019 pthread_mutex_unlock (&write_lock);
2021 if (wql < write_limit_low)
2022 return (0.0);
2023 if (wql >= write_limit_high)
2024 return (1.0);
2026 pos = 1 + wql - write_limit_low;
2027 size = 1 + write_limit_high - write_limit_low;
2029 return (((double) pos) / ((double) size));
2030 } /* }}} double get_drop_probability */
2032 static _Bool check_drop_value (void) /* {{{ */
2033 {
2034 static cdtime_t last_message_time = 0;
2035 static pthread_mutex_t last_message_lock = PTHREAD_MUTEX_INITIALIZER;
2037 double p;
2038 double q;
2039 int status;
2041 if (write_limit_high == 0)
2042 return (0);
2044 p = get_drop_probability ();
2045 if (p == 0.0)
2046 return (0);
2048 status = pthread_mutex_trylock (&last_message_lock);
2049 if (status == 0)
2050 {
2051 cdtime_t now;
2053 now = cdtime ();
2054 if ((now - last_message_time) > TIME_T_TO_CDTIME_T (1))
2055 {
2056 last_message_time = now;
2057 ERROR ("plugin_dispatch_values: Low water mark "
2058 "reached. Dropping %.0f%% of metrics.",
2059 100.0 * p);
2060 }
2061 pthread_mutex_unlock (&last_message_lock);
2062 }
2064 if (p == 1.0)
2065 return (1);
2067 q = cdrand_d ();
2068 if (q > p)
2069 return (1);
2070 else
2071 return (0);
2072 } /* }}} _Bool check_drop_value */
2074 int plugin_dispatch_values (value_list_t const *vl)
2075 {
2076 int status;
2078 if (check_drop_value ())
2079 return (0);
2081 status = plugin_write_enqueue (vl);
2082 if (status != 0)
2083 {
2084 char errbuf[1024];
2085 ERROR ("plugin_dispatch_values: plugin_write_enqueue failed "
2086 "with status %i (%s).", status,
2087 sstrerror (status, errbuf, sizeof (errbuf)));
2088 return (status);
2089 }
2091 return (0);
2092 }
2094 int plugin_dispatch_notification (const notification_t *notif)
2095 {
2096 llentry_t *le;
2097 /* Possible TODO: Add flap detection here */
2099 DEBUG ("plugin_dispatch_notification: severity = %i; message = %s; "
2100 "time = %.3f; host = %s;",
2101 notif->severity, notif->message,
2102 CDTIME_T_TO_DOUBLE (notif->time), notif->host);
2104 /* Nobody cares for notifications */
2105 if (list_notification == NULL)
2106 return (-1);
2108 le = llist_head (list_notification);
2109 while (le != NULL)
2110 {
2111 callback_func_t *cf;
2112 plugin_notification_cb callback;
2113 int status;
2115 /* do not switch plugin context; rather keep the context
2116 * (interval) information of the calling plugin */
2118 cf = le->value;
2119 callback = cf->cf_callback;
2120 status = (*callback) (notif, &cf->cf_udata);
2121 if (status != 0)
2122 {
2123 WARNING ("plugin_dispatch_notification: Notification "
2124 "callback %s returned %i.",
2125 le->key, status);
2126 }
2128 le = le->next;
2129 }
2131 return (0);
2132 } /* int plugin_dispatch_notification */
2134 void plugin_log (int level, const char *format, ...)
2135 {
2136 char msg[1024];
2137 va_list ap;
2138 llentry_t *le;
2140 #if !COLLECT_DEBUG
2141 if (level >= LOG_DEBUG)
2142 return;
2143 #endif
2145 va_start (ap, format);
2146 vsnprintf (msg, sizeof (msg), format, ap);
2147 msg[sizeof (msg) - 1] = '\0';
2148 va_end (ap);
2150 if (list_log == NULL)
2151 {
2152 fprintf (stderr, "%s\n", msg);
2153 return;
2154 }
2156 le = llist_head (list_log);
2157 while (le != NULL)
2158 {
2159 callback_func_t *cf;
2160 plugin_log_cb callback;
2162 cf = le->value;
2163 callback = cf->cf_callback;
2165 /* do not switch plugin context; rather keep the context
2166 * (interval) information of the calling plugin */
2168 (*callback) (level, msg, &cf->cf_udata);
2170 le = le->next;
2171 }
2172 } /* void plugin_log */
2174 int parse_log_severity (const char *severity)
2175 {
2176 int log_level = -1;
2178 if ((0 == strcasecmp (severity, "emerg"))
2179 || (0 == strcasecmp (severity, "alert"))
2180 || (0 == strcasecmp (severity, "crit"))
2181 || (0 == strcasecmp (severity, "err")))
2182 log_level = LOG_ERR;
2183 else if (0 == strcasecmp (severity, "warning"))
2184 log_level = LOG_WARNING;
2185 else if (0 == strcasecmp (severity, "notice"))
2186 log_level = LOG_NOTICE;
2187 else if (0 == strcasecmp (severity, "info"))
2188 log_level = LOG_INFO;
2189 #if COLLECT_DEBUG
2190 else if (0 == strcasecmp (severity, "debug"))
2191 log_level = LOG_DEBUG;
2192 #endif /* COLLECT_DEBUG */
2194 return (log_level);
2195 } /* int parse_log_severity */
2197 int parse_notif_severity (const char *severity)
2198 {
2199 int notif_severity = -1;
2201 if (strcasecmp (severity, "FAILURE") == 0)
2202 notif_severity = NOTIF_FAILURE;
2203 else if (strcmp (severity, "OKAY") == 0)
2204 notif_severity = NOTIF_OKAY;
2205 else if ((strcmp (severity, "WARNING") == 0)
2206 || (strcmp (severity, "WARN") == 0))
2207 notif_severity = NOTIF_WARNING;
2209 return (notif_severity);
2210 } /* int parse_notif_severity */
2212 const data_set_t *plugin_get_ds (const char *name)
2213 {
2214 data_set_t *ds;
2216 if (data_sets == NULL)
2217 {
2218 ERROR ("plugin_get_ds: No data sets are defined yet.");
2219 return (NULL);
2220 }
2222 if (c_avl_get (data_sets, name, (void *) &ds) != 0)
2223 {
2224 DEBUG ("No such dataset registered: %s", name);
2225 return (NULL);
2226 }
2228 return (ds);
2229 } /* data_set_t *plugin_get_ds */
2231 static int plugin_notification_meta_add (notification_t *n,
2232 const char *name,
2233 enum notification_meta_type_e type,
2234 const void *value)
2235 {
2236 notification_meta_t *meta;
2237 notification_meta_t *tail;
2239 if ((n == NULL) || (name == NULL) || (value == NULL))
2240 {
2241 ERROR ("plugin_notification_meta_add: A pointer is NULL!");
2242 return (-1);
2243 }
2245 meta = (notification_meta_t *) malloc (sizeof (notification_meta_t));
2246 if (meta == NULL)
2247 {
2248 ERROR ("plugin_notification_meta_add: malloc failed.");
2249 return (-1);
2250 }
2251 memset (meta, 0, sizeof (notification_meta_t));
2253 sstrncpy (meta->name, name, sizeof (meta->name));
2254 meta->type = type;
2256 switch (type)
2257 {
2258 case NM_TYPE_STRING:
2259 {
2260 meta->nm_value.nm_string = strdup ((const char *) value);
2261 if (meta->nm_value.nm_string == NULL)
2262 {
2263 ERROR ("plugin_notification_meta_add: strdup failed.");
2264 sfree (meta);
2265 return (-1);
2266 }
2267 break;
2268 }
2269 case NM_TYPE_SIGNED_INT:
2270 {
2271 meta->nm_value.nm_signed_int = *((int64_t *) value);
2272 break;
2273 }
2274 case NM_TYPE_UNSIGNED_INT:
2275 {
2276 meta->nm_value.nm_unsigned_int = *((uint64_t *) value);
2277 break;
2278 }
2279 case NM_TYPE_DOUBLE:
2280 {
2281 meta->nm_value.nm_double = *((double *) value);
2282 break;
2283 }
2284 case NM_TYPE_BOOLEAN:
2285 {
2286 meta->nm_value.nm_boolean = *((_Bool *) value);
2287 break;
2288 }
2289 default:
2290 {
2291 ERROR ("plugin_notification_meta_add: Unknown type: %i", type);
2292 sfree (meta);
2293 return (-1);
2294 }
2295 } /* switch (type) */
2297 meta->next = NULL;
2298 tail = n->meta;
2299 while ((tail != NULL) && (tail->next != NULL))
2300 tail = tail->next;
2302 if (tail == NULL)
2303 n->meta = meta;
2304 else
2305 tail->next = meta;
2307 return (0);
2308 } /* int plugin_notification_meta_add */
2310 int plugin_notification_meta_add_string (notification_t *n,
2311 const char *name,
2312 const char *value)
2313 {
2314 return (plugin_notification_meta_add (n, name, NM_TYPE_STRING, value));
2315 }
2317 int plugin_notification_meta_add_signed_int (notification_t *n,
2318 const char *name,
2319 int64_t value)
2320 {
2321 return (plugin_notification_meta_add (n, name, NM_TYPE_SIGNED_INT, &value));
2322 }
2324 int plugin_notification_meta_add_unsigned_int (notification_t *n,
2325 const char *name,
2326 uint64_t value)
2327 {
2328 return (plugin_notification_meta_add (n, name, NM_TYPE_UNSIGNED_INT, &value));
2329 }
2331 int plugin_notification_meta_add_double (notification_t *n,
2332 const char *name,
2333 double value)
2334 {
2335 return (plugin_notification_meta_add (n, name, NM_TYPE_DOUBLE, &value));
2336 }
2338 int plugin_notification_meta_add_boolean (notification_t *n,
2339 const char *name,
2340 _Bool value)
2341 {
2342 return (plugin_notification_meta_add (n, name, NM_TYPE_BOOLEAN, &value));
2343 }
2345 int plugin_notification_meta_copy (notification_t *dst,
2346 const notification_t *src)
2347 {
2348 notification_meta_t *meta;
2350 assert (dst != NULL);
2351 assert (src != NULL);
2352 assert (dst != src);
2353 assert ((src->meta == NULL) || (src->meta != dst->meta));
2355 for (meta = src->meta; meta != NULL; meta = meta->next)
2356 {
2357 if (meta->type == NM_TYPE_STRING)
2358 plugin_notification_meta_add_string (dst, meta->name,
2359 meta->nm_value.nm_string);
2360 else if (meta->type == NM_TYPE_SIGNED_INT)
2361 plugin_notification_meta_add_signed_int (dst, meta->name,
2362 meta->nm_value.nm_signed_int);
2363 else if (meta->type == NM_TYPE_UNSIGNED_INT)
2364 plugin_notification_meta_add_unsigned_int (dst, meta->name,
2365 meta->nm_value.nm_unsigned_int);
2366 else if (meta->type == NM_TYPE_DOUBLE)
2367 plugin_notification_meta_add_double (dst, meta->name,
2368 meta->nm_value.nm_double);
2369 else if (meta->type == NM_TYPE_BOOLEAN)
2370 plugin_notification_meta_add_boolean (dst, meta->name,
2371 meta->nm_value.nm_boolean);
2372 }
2374 return (0);
2375 } /* int plugin_notification_meta_copy */
2377 int plugin_notification_meta_free (notification_meta_t *n)
2378 {
2379 notification_meta_t *this;
2380 notification_meta_t *next;
2382 if (n == NULL)
2383 {
2384 ERROR ("plugin_notification_meta_free: n == NULL!");
2385 return (-1);
2386 }
2388 this = n;
2389 while (this != NULL)
2390 {
2391 next = this->next;
2393 if (this->type == NM_TYPE_STRING)
2394 {
2395 free ((char *)this->nm_value.nm_string);
2396 this->nm_value.nm_string = NULL;
2397 }
2398 sfree (this);
2400 this = next;
2401 }
2403 return (0);
2404 } /* int plugin_notification_meta_free */
2406 static void plugin_ctx_destructor (void *ctx)
2407 {
2408 sfree (ctx);
2409 } /* void plugin_ctx_destructor */
2411 static plugin_ctx_t ctx_init = { /* interval = */ 0 };
2413 static plugin_ctx_t *plugin_ctx_create (void)
2414 {
2415 plugin_ctx_t *ctx;
2417 ctx = malloc (sizeof (*ctx));
2418 if (ctx == NULL) {
2419 char errbuf[1024];
2420 ERROR ("Failed to allocate plugin context: %s",
2421 sstrerror (errno, errbuf, sizeof (errbuf)));
2422 return NULL;
2423 }
2425 *ctx = ctx_init;
2426 assert (plugin_ctx_key_initialized);
2427 pthread_setspecific (plugin_ctx_key, ctx);
2428 DEBUG("Created new plugin context.");
2429 return (ctx);
2430 } /* int plugin_ctx_create */
2432 void plugin_init_ctx (void)
2433 {
2434 pthread_key_create (&plugin_ctx_key, plugin_ctx_destructor);
2435 plugin_ctx_key_initialized = 1;
2436 } /* void plugin_init_ctx */
2438 plugin_ctx_t plugin_get_ctx (void)
2439 {
2440 plugin_ctx_t *ctx;
2442 assert (plugin_ctx_key_initialized);
2443 ctx = pthread_getspecific (plugin_ctx_key);
2445 if (ctx == NULL) {
2446 ctx = plugin_ctx_create ();
2447 /* this must no happen -- exit() instead? */
2448 if (ctx == NULL)
2449 return ctx_init;
2450 }
2452 return (*ctx);
2453 } /* plugin_ctx_t plugin_get_ctx */
2455 plugin_ctx_t plugin_set_ctx (plugin_ctx_t ctx)
2456 {
2457 plugin_ctx_t *c;
2458 plugin_ctx_t old;
2460 assert (plugin_ctx_key_initialized);
2461 c = pthread_getspecific (plugin_ctx_key);
2463 if (c == NULL) {
2464 c = plugin_ctx_create ();
2465 /* this must no happen -- exit() instead? */
2466 if (c == NULL)
2467 return ctx_init;
2468 }
2470 old = *c;
2471 *c = ctx;
2473 return (old);
2474 } /* void plugin_set_ctx */
2476 cdtime_t plugin_get_interval (void)
2477 {
2478 cdtime_t interval;
2480 interval = plugin_get_ctx().interval;
2481 if (interval > 0)
2482 return interval;
2484 return cf_get_default_interval ();
2485 } /* cdtime_t plugin_get_interval */
2487 typedef struct {
2488 plugin_ctx_t ctx;
2489 void *(*start_routine) (void *);
2490 void *arg;
2491 } plugin_thread_t;
2493 static void *plugin_thread_start (void *arg)
2494 {
2495 plugin_thread_t *plugin_thread = arg;
2497 void *(*start_routine) (void *) = plugin_thread->start_routine;
2498 void *plugin_arg = plugin_thread->arg;
2500 plugin_set_ctx (plugin_thread->ctx);
2502 free (plugin_thread);
2504 return start_routine (plugin_arg);
2505 } /* void *plugin_thread_start */
2507 int plugin_thread_create (pthread_t *thread, const pthread_attr_t *attr,
2508 void *(*start_routine) (void *), void *arg)
2509 {
2510 plugin_thread_t *plugin_thread;
2512 plugin_thread = malloc (sizeof (*plugin_thread));
2513 if (plugin_thread == NULL)
2514 return -1;
2516 plugin_thread->ctx = plugin_get_ctx ();
2517 plugin_thread->start_routine = start_routine;
2518 plugin_thread->arg = arg;
2520 return pthread_create (thread, attr,
2521 plugin_thread_start, plugin_thread);
2522 } /* int plugin_thread_create */
2524 /* vim: set sw=8 ts=8 noet fdm=marker : */