2 * collectd - src/entropy.c
3 * Copyright (C) 2007 Florian octo Forster
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.
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.
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
19 * Florian octo Forster <octo at verplant.org>
27 # error "No applicable input method."
30 #define ENTROPY_FILE "/proc/sys/kernel/random/entropy_avail"
32 static void entropy_submit (double entropy)
35 value_list_t vl = VALUE_LIST_INIT;
37 values[0].gauge = entropy;
41 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
42 sstrncpy (vl.plugin, "entropy", sizeof (vl.plugin));
43 sstrncpy (vl.type, "entropy", sizeof (vl.type));
45 plugin_dispatch_values (&vl);
48 static int entropy_read (void)
54 fh = fopen (ENTROPY_FILE, "r");
58 if (fgets (buffer, sizeof (buffer), fh) == NULL)
65 entropy = atof (buffer);
68 entropy_submit (entropy);
73 void module_register (void)
75 plugin_register_read ("entropy", entropy_read);
76 } /* void module_register */