1 /**
2 * collectd - src/unixsock.c
3 * Copyright (C) 2007 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 * Author:
19 * Florian octo Forster <octo at verplant.org>
20 **/
22 #include "collectd.h"
23 #include "common.h"
24 #include "plugin.h"
25 #include "configfile.h"
27 /* Folks without pthread will need to disable this plugin. */
28 #include <pthread.h>
30 #include <sys/socket.h>
31 #include <sys/un.h>
33 #include <grp.h>
35 #ifndef UNIX_PATH_MAX
36 # define UNIX_PATH_MAX sizeof (((struct sockaddr_un *)0)->sun_path)
37 #endif
39 #define US_DEFAULT_PATH PREFIX"/var/run/"PACKAGE_NAME"-unixsock"
41 /*
42 * Private data structures
43 */
44 /* linked list of cached values */
45 typedef struct value_cache_s
46 {
47 char name[4*DATA_MAX_NAME_LEN];
48 int values_num;
49 gauge_t *gauge;
50 counter_t *counter;
51 const data_set_t *ds;
52 time_t time;
53 struct value_cache_s *next;
54 } value_cache_t;
56 /*
57 * Private variables
58 */
59 /* valid configuration file keys */
60 static const char *config_keys[] =
61 {
62 "SocketFile",
63 "SocketGroup",
64 "SocketPerms",
65 NULL
66 };
67 static int config_keys_num = 3;
69 static int loop = 0;
71 /* socket configuration */
72 static int sock_fd = -1;
73 static char *sock_file = NULL;
74 static char *sock_group = NULL;
75 static int sock_perms = S_IRWXU | S_IRWXG;
77 static pthread_t listen_thread = (pthread_t) 0;
79 /* Linked list and auxilliary variables for saving values */
80 static value_cache_t *cache_head = NULL;
81 static pthread_mutex_t cache_lock = PTHREAD_MUTEX_INITIALIZER;
82 static unsigned int cache_oldest = UINT_MAX;
84 /*
85 * Functions
86 */
87 static int parse_identifier (char *str, char **ret_host,
88 char **ret_plugin, char **ret_plugin_instance,
89 char **ret_type, char **ret_type_instance)
90 {
91 char *hostname = NULL;
92 char *plugin = NULL;
93 char *plugin_instance = NULL;
94 char *type = NULL;
95 char *type_instance = NULL;
97 hostname = str;
98 if (hostname == NULL)
99 return (-1);
101 plugin = strchr (hostname, '/');
102 if (plugin == NULL)
103 return (-1);
104 *plugin = '\0'; plugin++;
106 type = strchr (plugin, '/');
107 if (type == NULL)
108 return (-1);
109 *type = '\0'; type++;
111 plugin_instance = strchr (plugin, '-');
112 if (plugin_instance != NULL)
113 {
114 *plugin_instance = '\0';
115 plugin_instance++;
116 }
118 type_instance = strchr (type, '-');
119 if (type_instance != NULL)
120 {
121 *type_instance = '\0';
122 type_instance++;
123 }
125 *ret_host = hostname;
126 *ret_plugin = plugin;
127 *ret_plugin_instance = plugin_instance;
128 *ret_type = type;
129 *ret_type_instance = type_instance;
130 return (0);
131 } /* int parse_identifier */
133 static value_cache_t *cache_search (const char *name)
134 {
135 value_cache_t *vc;
137 for (vc = cache_head; vc != NULL; vc = vc->next)
138 {
139 if (strcmp (vc->name, name) == 0)
140 break;
141 } /* for vc = cache_head .. NULL */
143 return (vc);
144 } /* value_cache_t *cache_search */
146 static int cache_insert (const data_set_t *ds, const value_list_t *vl)
147 {
148 /* We're called from `cache_update' so we don't need to lock the mutex */
149 value_cache_t *vc;
150 int i;
152 DEBUG ("unixsock plugin: cache_insert: ds->type = %s; ds->ds_num = %i;"
153 " vl->values_len = %i;",
154 ds->type, ds->ds_num, vl->values_len);
155 assert (ds->ds_num == vl->values_len);
157 vc = (value_cache_t *) malloc (sizeof (value_cache_t));
158 if (vc == NULL)
159 {
160 char errbuf[1024];
161 pthread_mutex_unlock (&cache_lock);
162 ERROR ("unixsock plugin: malloc failed: %s",
163 sstrerror (errno, errbuf, sizeof (errbuf)));
164 return (-1);
165 }
167 vc->gauge = (gauge_t *) malloc (sizeof (gauge_t) * vl->values_len);
168 if (vc->gauge == NULL)
169 {
170 char errbuf[1024];
171 pthread_mutex_unlock (&cache_lock);
172 ERROR ("unixsock plugin: malloc failed: %s",
173 sstrerror (errno, errbuf, sizeof (errbuf)));
174 free (vc);
175 return (-1);
176 }
178 vc->counter = (counter_t *) malloc (sizeof (counter_t) * vl->values_len);
179 if (vc->counter == NULL)
180 {
181 char errbuf[1024];
182 pthread_mutex_unlock (&cache_lock);
183 ERROR ("unixsock plugin: malloc failed: %s",
184 sstrerror (errno, errbuf, sizeof (errbuf)));
185 free (vc->gauge);
186 free (vc);
187 return (-1);
188 }
190 if (FORMAT_VL (vc->name, sizeof (vc->name), vl, ds))
191 {
192 pthread_mutex_unlock (&cache_lock);
193 ERROR ("unixsock plugin: FORMAT_VL failed.");
194 free (vc->counter);
195 free (vc->gauge);
196 free (vc);
197 return (-1);
198 }
200 for (i = 0; i < ds->ds_num; i++)
201 {
202 if (ds->ds[i].type == DS_TYPE_COUNTER)
203 {
204 vc->gauge[i] = 0.0;
205 vc->counter[i] = vl->values[i].counter;
206 }
207 else if (ds->ds[i].type == DS_TYPE_GAUGE)
208 {
209 vc->gauge[i] = vl->values[i].gauge;
210 vc->counter[i] = 0;
211 }
212 else
213 {
214 vc->gauge[i] = 0.0;
215 vc->counter[i] = 0;
216 }
217 }
218 vc->values_num = ds->ds_num;
219 vc->ds = ds;
221 vc->next = cache_head;
222 cache_head = vc;
224 vc->time = vl->time;
225 if (vc->time < cache_oldest)
226 cache_oldest = vc->time;
228 pthread_mutex_unlock (&cache_lock);
229 return (0);
230 } /* int cache_insert */
232 static int cache_update (const data_set_t *ds, const value_list_t *vl)
233 {
234 char name[4*DATA_MAX_NAME_LEN];;
235 value_cache_t *vc;
236 int i;
238 if (FORMAT_VL (name, sizeof (name), vl, ds) != 0)
239 return (-1);
241 pthread_mutex_lock (&cache_lock);
243 vc = cache_search (name);
245 /* pthread_mutex_lock is called by cache_insert. */
246 if (vc == NULL)
247 return (cache_insert (ds, vl));
249 assert (vc->values_num == ds->ds_num);
250 assert (vc->values_num == vl->values_len);
252 /* Avoid floating-point exceptions due to division by zero. */
253 if (vc->time >= vl->time)
254 {
255 pthread_mutex_unlock (&cache_lock);
256 ERROR ("unixsock plugin: vc->time >= vl->time. vc->time = %u; "
257 "vl->time = %u; vl = %s;",
258 (unsigned int) vc->time, (unsigned int) vl->time,
259 name);
260 return (-1);
261 } /* if (vc->time >= vl->time) */
263 /*
264 * Update the values. This is possibly a lot more that you'd expect
265 * because we honor min and max values and handle counter overflows here.
266 */
267 for (i = 0; i < ds->ds_num; i++)
268 {
269 if (ds->ds[i].type == DS_TYPE_COUNTER)
270 {
271 if (vl->values[i].counter < vc->counter[i])
272 {
273 if (vl->values[i].counter <= 4294967295U)
274 {
275 vc->gauge[i] = ((4294967295U - vl->values[i].counter)
276 + vc->counter[i]) / (vl->time - vc->time);
277 }
278 else
279 {
280 vc->gauge[i] = ((18446744073709551615ULL - vl->values[i].counter)
281 + vc->counter[i]) / (vl->time - vc->time);
282 }
283 }
284 else
285 {
286 vc->gauge[i] = (vl->values[i].counter - vc->counter[i])
287 / (vl->time - vc->time);
288 }
290 vc->counter[i] = vl->values[i].counter;
291 }
292 else if (ds->ds[i].type == DS_TYPE_GAUGE)
293 {
294 vc->gauge[i] = vl->values[i].gauge;
295 vc->counter[i] = 0;
296 }
297 else
298 {
299 vc->gauge[i] = NAN;
300 vc->counter[i] = 0;
301 }
303 if (isnan (vc->gauge[i])
304 || (!isnan (ds->ds[i].min) && (vc->gauge[i] < ds->ds[i].min))
305 || (!isnan (ds->ds[i].max) && (vc->gauge[i] > ds->ds[i].max)))
306 vc->gauge[i] = NAN;
307 } /* for i = 0 .. ds->ds_num */
309 vc->ds = ds;
310 vc->time = vl->time;
312 if (vc->time < cache_oldest)
313 cache_oldest = vc->time;
315 pthread_mutex_unlock (&cache_lock);
316 return (0);
317 } /* int cache_update */
319 static void cache_flush (int max_age)
320 {
321 value_cache_t *this;
322 value_cache_t *prev;
323 time_t now;
325 pthread_mutex_lock (&cache_lock);
327 now = time (NULL);
329 if ((now - cache_oldest) <= max_age)
330 {
331 pthread_mutex_unlock (&cache_lock);
332 return;
333 }
335 cache_oldest = now;
337 prev = NULL;
338 this = cache_head;
340 while (this != NULL)
341 {
342 if ((now - this->time) <= max_age)
343 {
344 if (this->time < cache_oldest)
345 cache_oldest = this->time;
347 prev = this;
348 this = this->next;
349 continue;
350 }
352 if (prev == NULL)
353 cache_head = this->next;
354 else
355 prev->next = this->next;
357 free (this->gauge);
358 free (this->counter);
359 free (this);
361 if (prev == NULL)
362 this = cache_head;
363 else
364 this = prev->next;
365 } /* while (this != NULL) */
367 pthread_mutex_unlock (&cache_lock);
368 } /* int cache_flush */
370 static int us_open_socket (void)
371 {
372 struct sockaddr_un sa;
373 int status;
375 sock_fd = socket (PF_UNIX, SOCK_STREAM, 0);
376 if (sock_fd < 0)
377 {
378 char errbuf[1024];
379 ERROR ("unixsock plugin: socket failed: %s",
380 sstrerror (errno, errbuf, sizeof (errbuf)));
381 return (-1);
382 }
384 memset (&sa, '\0', sizeof (sa));
385 sa.sun_family = AF_UNIX;
386 strncpy (sa.sun_path, (sock_file != NULL) ? sock_file : US_DEFAULT_PATH,
387 sizeof (sa.sun_path) - 1);
388 /* unlink (sa.sun_path); */
390 status = bind (sock_fd, (struct sockaddr *) &sa, sizeof (sa));
391 if (status != 0)
392 {
393 char errbuf[1024];
394 sstrerror (errno, errbuf, sizeof (errbuf));
395 DEBUG ("bind failed: %s; sa.sun_path = %s", errbuf, sa.sun_path);
396 ERROR ("unixsock plugin: bind failed: %s", errbuf);
397 close (sock_fd);
398 sock_fd = -1;
399 return (-1);
400 }
402 status = listen (sock_fd, 8);
403 if (status != 0)
404 {
405 char errbuf[1024];
406 ERROR ("unixsock plugin: listen failed: %s",
407 sstrerror (errno, errbuf, sizeof (errbuf)));
408 close (sock_fd);
409 sock_fd = -1;
410 return (-1);
411 }
413 do
414 {
415 char *grpname;
416 struct group *g;
417 struct group sg;
418 char grbuf[2048];
420 grpname = (sock_group != NULL) ? sock_group : COLLECTD_GRP_NAME;
421 g = NULL;
423 status = getgrnam_r (grpname, &sg, grbuf, sizeof (grbuf), &g);
424 if (status != 0)
425 {
426 char errbuf[1024];
427 WARNING ("unixsock plugin: getgrnam_r (%s) failed: %s", grpname,
428 sstrerror (errno, errbuf, sizeof (errbuf)));
429 break;
430 }
431 if (g == NULL)
432 {
433 WARNING ("unixsock plugin: No such group: `%s'",
434 grpname);
435 break;
436 }
438 if (chown ((sock_file != NULL) ? sock_file : US_DEFAULT_PATH,
439 (uid_t) -1, g->gr_gid) != 0)
440 {
441 char errbuf[1024];
442 WARNING ("unixsock plugin: chown (%s, -1, %i) failed: %s",
443 (sock_file != NULL) ? sock_file : US_DEFAULT_PATH,
444 (int) g->gr_gid,
445 sstrerror (errno, errbuf, sizeof (errbuf)));
446 }
447 } while (0);
449 return (0);
450 } /* int us_open_socket */
452 static int us_handle_getval (FILE *fh, char **fields, int fields_num)
453 {
454 char *hostname;
455 char *plugin;
456 char *plugin_instance;
457 char *type;
458 char *type_instance;
459 char name[4*DATA_MAX_NAME_LEN];
460 value_cache_t *vc;
461 int status;
462 int i;
464 if (fields_num != 2)
465 {
466 DEBUG ("unixsock plugin: Wrong number of fields: %i", fields_num);
467 fprintf (fh, "-1 Wrong number of fields: Got %i, expected 2.\n",
468 fields_num);
469 fflush (fh);
470 return (-1);
471 }
472 DEBUG ("unixsock plugin: Got query for `%s'", fields[1]);
474 status = parse_identifier (fields[1], &hostname,
475 &plugin, &plugin_instance,
476 &type, &type_instance);
477 if (status != 0)
478 {
479 DEBUG ("unixsock plugin: Cannot parse `%s'", fields[1]);
480 fprintf (fh, "-1 Cannot parse identifier.\n");
481 fflush (fh);
482 return (-1);
483 }
485 status = format_name (name, sizeof (name),
486 hostname, plugin, plugin_instance, type, type_instance);
487 /* FIXME: Send some response */
488 if (status != 0)
489 return (-1);
491 pthread_mutex_lock (&cache_lock);
493 DEBUG ("vc = cache_search (%s)", name);
494 vc = cache_search (name);
496 if (vc == NULL)
497 {
498 DEBUG ("Did not find cache entry.");
499 fprintf (fh, "-1 No such value");
500 }
501 else
502 {
503 DEBUG ("Found cache entry.");
504 fprintf (fh, "%i", vc->values_num);
505 for (i = 0; i < vc->values_num; i++)
506 {
507 fprintf (fh, " %s=", vc->ds->ds[i].name);
508 if (isnan (vc->gauge[i]))
509 fprintf (fh, "NaN");
510 else
511 fprintf (fh, "%12e", vc->gauge[i]);
512 }
513 }
515 /* Free the mutex as soon as possible and definitely before flushing */
516 pthread_mutex_unlock (&cache_lock);
518 fprintf (fh, "\n");
519 fflush (fh);
521 return (0);
522 } /* int us_handle_getval */
524 static int us_handle_putval (FILE *fh, char **fields, int fields_num)
525 {
526 char *hostname;
527 char *plugin;
528 char *plugin_instance;
529 char *type;
530 char *type_instance;
531 int status;
532 int i;
534 const data_set_t *ds;
535 value_list_t vl = VALUE_LIST_INIT;
537 char **value_ptr;
539 if (fields_num != 3)
540 {
541 DEBUG ("unixsock plugin: Wrong number of fields: %i", fields_num);
542 fprintf (fh, "-1 Wrong number of fields: Got %i, expected 3.\n",
543 fields_num);
544 fflush (fh);
545 return (-1);
546 }
548 status = parse_identifier (fields[1], &hostname,
549 &plugin, &plugin_instance,
550 &type, &type_instance);
551 if (status != 0)
552 {
553 DEBUG ("unixsock plugin: Cannot parse `%s'", fields[1]);
554 fprintf (fh, "-1 Cannot parse identifier.\n");
555 fflush (fh);
556 return (-1);
557 }
559 /* FIXME: Send some response */
560 if ((strlen (hostname) > sizeof (vl.host))
561 || (strlen (plugin) > sizeof (vl.plugin))
562 || ((plugin_instance != NULL)
563 && (strlen (plugin_instance) > sizeof (vl.plugin_instance)))
564 || ((type_instance != NULL)
565 && (strlen (type_instance) > sizeof (vl.type_instance))))
566 return (-1);
568 strcpy (vl.host, hostname);
569 strcpy (vl.plugin, plugin);
570 if (plugin_instance != NULL)
571 strcpy (vl.plugin_instance, plugin_instance);
572 if (type_instance != NULL)
573 strcpy (vl.type_instance, type_instance);
575 { /* parse the time */
576 char *t = fields[2];
577 char *v = strchr (t, ':');
578 if (v == NULL)
579 return (-1);
580 *v = '\0'; v++;
582 vl.time = (time_t) atoi (t);
583 if (vl.time == 0)
584 vl.time = time (NULL);
586 fields[2] = v;
587 }
589 ds = plugin_get_ds (type);
590 if (ds == NULL)
591 return (-1);
593 value_ptr = (char **) calloc (ds->ds_num, sizeof (char *));
594 /* FIXME: Send some response */
595 if (value_ptr == NULL)
596 return (-1);
599 { /* parse the value-list. It's colon-separated. */
600 char *dummy;
601 char *ptr;
602 char *saveptr;
604 i = 0;
605 dummy = fields[2];
606 saveptr = NULL;
607 while ((ptr = strtok_r (dummy, ":", &saveptr)) != NULL)
608 {
609 dummy = NULL;
610 if (i >= ds->ds_num)
611 {
612 i = ds->ds_num + 1;
613 break;
614 }
615 value_ptr[i] = ptr;
616 i++;
617 }
619 if (i != ds->ds_num)
620 {
621 sfree (value_ptr);
622 /* FIXME: Send some response */
623 return (-1);
624 }
625 } /* done parsing the value-list */
627 vl.values_len = ds->ds_num;
628 vl.values = (value_t *) malloc (vl.values_len * sizeof (value_t));
629 if (vl.values == NULL)
630 {
631 sfree (value_ptr);
632 return (-1);
633 }
634 DEBUG ("value_ptr = 0x%p; vl.values = 0x%p;", (void *) value_ptr, (void *) vl.values);
636 for (i = 0; i < ds->ds_num; i++)
637 {
638 if (strcmp (value_ptr[i], "U") == 0)
639 vl.values[i].gauge = NAN;
640 else if (ds->ds[i].type == DS_TYPE_COUNTER)
641 vl.values[i].counter = atoll (value_ptr[i]);
642 else if (ds->ds[i].type == DS_TYPE_GAUGE)
643 vl.values[i].gauge = atof (value_ptr[i]);
644 } /* for (i = 2 .. fields_num) */
646 plugin_dispatch_values (type, &vl);
648 DEBUG ("value_ptr = 0x%p; vl.values = 0x%p;", (void *) value_ptr, (void *) vl.values);
650 sfree (value_ptr);
651 sfree (vl.values);
653 fprintf (fh, "0 Success\n");
654 fflush (fh);
656 return (0);
657 } /* int us_handle_putval */
659 static void *us_handle_client (void *arg)
660 {
661 int fd;
662 FILE *fh;
663 char buffer[1024];
664 char *fields[128];
665 int fields_num;
667 fd = *((int *) arg);
668 free (arg);
669 arg = NULL;
671 DEBUG ("Reading from fd #%i", fd);
673 fh = fdopen (fd, "r+");
674 if (fh == NULL)
675 {
676 char errbuf[1024];
677 ERROR ("unixsock plugin: fdopen failed: %s",
678 sstrerror (errno, errbuf, sizeof (errbuf)));
679 close (fd);
680 pthread_exit ((void *) 1);
681 }
683 while (fgets (buffer, sizeof (buffer), fh) != NULL)
684 {
685 int len;
687 len = strlen (buffer);
688 while ((len > 0)
689 && ((buffer[len - 1] == '\n') || (buffer[len - 1] == '\r')))
690 buffer[--len] = '\0';
692 if (len == 0)
693 continue;
695 DEBUG ("fgets -> buffer = %s; len = %i;", buffer, len);
697 fields_num = strsplit (buffer, fields,
698 sizeof (fields) / sizeof (fields[0]));
700 if (fields_num < 1)
701 {
702 close (fd);
703 break;
704 }
706 if (strcasecmp (fields[0], "getval") == 0)
707 {
708 us_handle_getval (fh, fields, fields_num);
709 }
710 else if (strcasecmp (fields[0], "putval") == 0)
711 {
712 us_handle_putval (fh, fields, fields_num);
713 }
714 else
715 {
716 fprintf (fh, "Unknown command: %s\n", fields[0]);
717 fflush (fh);
718 }
719 } /* while (fgets) */
721 DEBUG ("Exiting..");
722 close (fd);
724 pthread_exit ((void *) 0);
725 } /* void *us_handle_client */
727 static void *us_server_thread (void *arg)
728 {
729 int status;
730 int *remote_fd;
731 pthread_t th;
732 pthread_attr_t th_attr;
734 if (us_open_socket () != 0)
735 pthread_exit ((void *) 1);
737 while (loop != 0)
738 {
739 DEBUG ("Calling accept..");
740 status = accept (sock_fd, NULL, NULL);
741 if (status < 0)
742 {
743 char errbuf[1024];
745 if (errno == EINTR)
746 continue;
748 ERROR ("unixsock plugin: accept failed: %s",
749 sstrerror (errno, errbuf, sizeof (errbuf)));
750 close (sock_fd);
751 sock_fd = -1;
752 pthread_exit ((void *) 1);
753 }
755 remote_fd = (int *) malloc (sizeof (int));
756 if (remote_fd == NULL)
757 {
758 char errbuf[1024];
759 WARNING ("unixsock plugin: malloc failed: %s",
760 sstrerror (errno, errbuf, sizeof (errbuf)));
761 close (status);
762 continue;
763 }
764 *remote_fd = status;
766 DEBUG ("Spawning child to handle connection on fd #%i", *remote_fd);
768 pthread_attr_init (&th_attr);
769 pthread_attr_setdetachstate (&th_attr, PTHREAD_CREATE_DETACHED);
771 status = pthread_create (&th, &th_attr, us_handle_client, (void *) remote_fd);
772 if (status != 0)
773 {
774 char errbuf[1024];
775 WARNING ("unixsock plugin: pthread_create failed: %s",
776 sstrerror (errno, errbuf, sizeof (errbuf)));
777 close (*remote_fd);
778 free (remote_fd);
779 continue;
780 }
781 } /* while (loop) */
783 close (sock_fd);
784 sock_fd = -1;
786 status = unlink ((sock_file != NULL) ? sock_file : US_DEFAULT_PATH);
787 if (status != 0)
788 {
789 char errbuf[1024];
790 NOTICE ("unixsock plugin: unlink (%s) failed: %s",
791 (sock_file != NULL) ? sock_file : US_DEFAULT_PATH,
792 sstrerror (errno, errbuf, sizeof (errbuf)));
793 }
795 return ((void *) 0);
796 } /* void *us_server_thread */
798 static int us_config (const char *key, const char *val)
799 {
800 if (strcasecmp (key, "SocketFile") == 0)
801 {
802 sfree (sock_file);
803 sock_file = strdup (val);
804 }
805 else if (strcasecmp (key, "SocketGroup") == 0)
806 {
807 sfree (sock_group);
808 sock_group = strdup (val);
809 }
810 else if (strcasecmp (key, "SocketPerms") == 0)
811 {
812 sock_perms = (int) strtol (val, NULL, 8);
813 }
814 else
815 {
816 return (-1);
817 }
819 return (0);
820 } /* int us_config */
822 static int us_init (void)
823 {
824 int status;
826 loop = 1;
828 status = pthread_create (&listen_thread, NULL, us_server_thread, NULL);
829 if (status != 0)
830 {
831 char errbuf[1024];
832 ERROR ("unixsock plugin: pthread_create failed: %s",
833 sstrerror (errno, errbuf, sizeof (errbuf)));
834 return (-1);
835 }
837 return (0);
838 } /* int us_init */
840 static int us_shutdown (void)
841 {
842 void *ret;
844 loop = 0;
846 if (listen_thread != (pthread_t) 0)
847 {
848 pthread_kill (listen_thread, SIGTERM);
849 pthread_join (listen_thread, &ret);
850 listen_thread = (pthread_t) 0;
851 }
853 plugin_unregister_init ("unixsock");
854 plugin_unregister_write ("unixsock");
855 plugin_unregister_shutdown ("unixsock");
857 return (0);
858 } /* int us_shutdown */
860 static int us_write (const data_set_t *ds, const value_list_t *vl)
861 {
862 cache_update (ds, vl);
863 cache_flush (2 * interval_g);
865 return (0);
866 }
868 void module_register (void)
869 {
870 plugin_register_config ("unixsock", us_config,
871 config_keys, config_keys_num);
872 plugin_register_init ("unixsock", us_init);
873 plugin_register_write ("unixsock", us_write);
874 plugin_register_shutdown ("unixsock", us_shutdown);
875 } /* void module_register (void) */
877 /* vim: set sw=4 ts=4 sts=4 tw=78 : */