3 * collectd - src/fhcount.c
4 * Copyright (c) 2015, Jiri Tyr <jiri.tyr at gmail.com>
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.
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.
26 static const char *config_keys[] = {
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) {
39 if (strcasecmp(key, "ValuesAbsolute") == 0) {
47 } else if (strcasecmp(key, "ValuesPercentage") == 0) {
49 values_percentage = 1;
51 values_percentage = 0;
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 };
69 sstrncpy(vl.host, hostname_g, sizeof(vl.host));
70 sstrncpy(vl.plugin, "fhcount", sizeof(vl.plugin));
71 sstrncpy(vl.type, type, sizeof(vl.type));
72 sstrncpy(vl.type_instance, type_instance, sizeof(vl.type_instance));
74 // Dispatch the metric
75 plugin_dispatch_values(&vl);
78 static int fhcount_read(void) {
81 gauge_t used, unused, max;
82 int prc_used, prc_unused;
84 char buffer[buffer_len];
89 fp = fopen("/proc/sys/fs/file-nr" , "r");
91 ERROR("fhcount: fopen: %s", sstrerror(errno, errbuf, sizeof(errbuf)));
94 if (fgets(buffer, buffer_len, fp) == NULL) {
95 ERROR("fhcount: fgets: %s", sstrerror(errno, errbuf, sizeof(errbuf)));
102 numfields = strsplit(buffer, fields, STATIC_ARRAY_SIZE(fields));
104 if (numfields != 3) {
105 ERROR("fhcount: Line doesn't contain 3 fields");
106 return(EXIT_FAILURE);
110 strtogauge(fields[0], &used);
111 strtogauge(fields[1], &unused);
112 strtogauge(fields[2], &max);
113 prc_used = (gauge_t) used/max*100;
114 prc_unused = (gauge_t) unused/max*100;
117 if (values_absolute) {
118 fhcount_submit("file_handles", "used", (gauge_t) used);
119 fhcount_submit("file_handles", "unused", (gauge_t) unused);
120 fhcount_submit("file_handles", "max", (gauge_t) max);
122 if (values_percentage) {
123 fhcount_submit("percent", "used", (gauge_t) prc_used);
124 fhcount_submit("percent", "unused", (gauge_t) prc_unused);
131 void module_register(void) {
132 plugin_register_config(
133 "fhcount", fhcount_config, config_keys, config_keys_num);
134 plugin_register_read("fhcount", fhcount_read);