1 /**
2 * collectd - src/entropy.c
3 * Copyright (C) 2007 Florian octo 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 octo Forster <octo at collectd.org>
25 **/
27 #include "collectd.h"
29 #include "common.h"
30 #include "plugin.h"
32 #if !KERNEL_LINUX
33 # error "No applicable input method."
34 #endif
36 #define ENTROPY_FILE "/proc/sys/kernel/random/entropy_avail"
38 static void entropy_submit (value_t value)
39 {
40 value_list_t vl = VALUE_LIST_INIT;
42 vl.values = &value;
43 vl.values_len = 1;
44 sstrncpy (vl.plugin, "entropy", sizeof (vl.plugin));
45 sstrncpy (vl.type, "entropy", sizeof (vl.type));
47 plugin_dispatch_values (&vl);
48 }
50 static int entropy_read (void)
51 {
52 value_t v;
53 if (parse_value_file (ENTROPY_FILE, &v, DS_TYPE_GAUGE) != 0)
54 {
55 ERROR ("entropy plugin: Reading \""ENTROPY_FILE"\" failed.");
56 return (-1);
57 }
59 entropy_submit (v);
60 return (0);
61 }
63 void module_register (void)
64 {
65 plugin_register_read ("entropy", entropy_read);
66 } /* void module_register */