1 /**
2 *
3 * collectd - src/fhcount.c
4 * Copyright (c) 2015, Jiri Tyr <jiri.tyr at gmail.com>
5 *
6 * Permission to use, copy, modify, and/or distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
13 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
15 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
16 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 *
18 **/
20 #include "collectd.h"
22 #include "common.h"
23 #include "plugin.h"
26 static const char *config_keys[] = {
27 "ValuesAbsolute",
28 "ValuesPercentage"
29 };
30 static int config_keys_num = STATIC_ARRAY_SIZE(config_keys);
32 static _Bool values_absolute = 1;
33 static _Bool values_percentage = 0;
36 static int fhcount_config(const char *key, const char *value) {
37 int ret = -1;
39 if (strcasecmp(key, "ValuesAbsolute") == 0) {
40 if (IS_TRUE(value)) {
41 values_absolute = 1;
42 } else {
43 values_absolute = 0;
44 }
46 ret = 0;
47 } else if (strcasecmp(key, "ValuesPercentage") == 0) {
48 if (IS_TRUE(value)) {
49 values_percentage = 1;
50 } else {
51 values_percentage = 0;
52 }
54 ret = 0;
55 }
57 return(ret);
58 }
61 static void fhcount_submit(
62 const char *type, const char *type_instance, gauge_t value) {
63 value_list_t vl = VALUE_LIST_INIT;
65 vl.values = &(value_t) { .gauge = value };
66 vl.values_len = 1;
68 // Compose the metric
69 sstrncpy(vl.plugin, "fhcount", sizeof(vl.plugin));
70 sstrncpy(vl.type, type, sizeof(vl.type));
71 sstrncpy(vl.type_instance, type_instance, sizeof(vl.type_instance));
73 // Dispatch the metric
74 plugin_dispatch_values(&vl);
75 }
77 static int fhcount_read(void) {
78 int numfields = 0;
79 int buffer_len = 60;
80 gauge_t used, unused, max;
81 int prc_used, prc_unused;
82 char *fields[3];
83 char buffer[buffer_len];
84 char errbuf[1024];
85 FILE *fp;
87 // Open file
88 fp = fopen("/proc/sys/fs/file-nr" , "r");
89 if (fp == NULL) {
90 ERROR("fhcount: fopen: %s", sstrerror(errno, errbuf, sizeof(errbuf)));
91 return(EXIT_FAILURE);
92 }
93 if (fgets(buffer, buffer_len, fp) == NULL) {
94 ERROR("fhcount: fgets: %s", sstrerror(errno, errbuf, sizeof(errbuf)));
95 fclose(fp);
96 return(EXIT_FAILURE);
97 }
98 fclose(fp);
100 // Tokenize string
101 numfields = strsplit(buffer, fields, STATIC_ARRAY_SIZE(fields));
103 if (numfields != 3) {
104 ERROR("fhcount: Line doesn't contain 3 fields");
105 return(EXIT_FAILURE);
106 }
108 // Define the values
109 strtogauge(fields[0], &used);
110 strtogauge(fields[1], &unused);
111 strtogauge(fields[2], &max);
112 prc_used = (gauge_t) used/max*100;
113 prc_unused = (gauge_t) unused/max*100;
115 // Submit values
116 if (values_absolute) {
117 fhcount_submit("file_handles", "used", (gauge_t) used);
118 fhcount_submit("file_handles", "unused", (gauge_t) unused);
119 fhcount_submit("file_handles", "max", (gauge_t) max);
120 }
121 if (values_percentage) {
122 fhcount_submit("percent", "used", (gauge_t) prc_used);
123 fhcount_submit("percent", "unused", (gauge_t) prc_unused);
124 }
126 return(0);
127 }
130 void module_register(void) {
131 plugin_register_config(
132 "fhcount", fhcount_config, config_keys, config_keys_num);
133 plugin_register_read("fhcount", fhcount_read);
134 }