1 /**
2 * collectd - src/match_empty_counter.c
3 * Copyright (C) 2009 Florian 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 Forster <octo at collectd.org>
25 **/
27 #include "collectd.h"
28 #include "common.h"
29 #include "filter_chain.h"
31 /*
32 * private data types
33 */
34 struct mec_match_s;
35 typedef struct mec_match_s mec_match_t;
36 struct mec_match_s
37 {
38 int dummy;
39 };
41 /*
42 * internal helper functions
43 */
44 static int mec_create (const oconfig_item_t *ci, void **user_data) /* {{{ */
45 {
46 mec_match_t *m;
48 m = calloc (1, sizeof (*m));
49 if (m == NULL)
50 {
51 ERROR ("mec_create: calloc failed.");
52 return (-ENOMEM);
53 }
55 if (ci->children_num != 0)
56 {
57 ERROR ("empty_counter match: This match does not take any additional "
58 "configuration.");
59 }
61 *user_data = m;
62 return (0);
63 } /* }}} int mec_create */
65 static int mec_destroy (void **user_data) /* {{{ */
66 {
67 if (user_data != NULL)
68 {
69 sfree (*user_data);
70 }
72 return (0);
73 } /* }}} int mec_destroy */
75 static int mec_match (const data_set_t __attribute__((unused)) *ds, /* {{{ */
76 const value_list_t *vl,
77 notification_meta_t __attribute__((unused)) **meta, void **user_data)
78 {
79 int num_counters;
80 int num_empty;
81 size_t i;
83 if ((user_data == NULL) || (*user_data == NULL))
84 return (-1);
87 num_counters = 0;
88 num_empty = 0;
90 for (i = 0; i < ds->ds_num; i++)
91 {
92 if ((ds->ds[i].type != DS_TYPE_DERIVE)
93 && (ds->ds[i].type != DS_TYPE_COUNTER))
94 continue;
96 num_counters++;
97 if (((ds->ds[i].type == DS_TYPE_DERIVE) && (vl->values[i].derive == 0))
98 || ((ds->ds[i].type == DS_TYPE_COUNTER) && (vl->values[i].counter == 0)))
99 num_empty++;
100 }
102 if (num_counters == 0)
103 return (FC_MATCH_NO_MATCH);
104 else if (num_counters == num_empty)
105 return (FC_MATCH_MATCHES);
106 else
107 return (FC_MATCH_NO_MATCH);
108 } /* }}} int mec_match */
110 void module_register (void)
111 {
112 match_proc_t mproc;
114 memset (&mproc, 0, sizeof (mproc));
115 mproc.create = mec_create;
116 mproc.destroy = mec_destroy;
117 mproc.match = mec_match;
118 fc_register_match ("empty_counter", mproc);
119 } /* module_register */
121 /* vim: set sw=2 sts=2 tw=78 et fdm=marker : */