2 * collectd - src/cpufreq.c
3 * Copyright (C) 2005-2007 Peter Holik
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; either version 2 of the License, or (at your
8 * option) any later version.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 * Peter Holik <peter at holik.at>
28 static int num_cpu = 0;
30 static int cpufreq_init (void)
39 status = ssnprintf (filename, sizeof (filename),
40 "/sys/devices/system/cpu/cpu%d/cpufreq/"
41 "scaling_cur_freq", num_cpu);
42 if ((status < 1) || ((unsigned int)status >= sizeof (filename)))
45 if (access (filename, R_OK))
51 INFO ("cpufreq plugin: Found %d CPU%s", num_cpu,
52 (num_cpu == 1) ? "" : "s");
55 plugin_unregister_read ("cpufreq");
58 } /* int cpufreq_init */
60 static void cpufreq_submit (int cpu_num, value_t value)
62 value_list_t vl = VALUE_LIST_INIT;
66 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
67 sstrncpy (vl.plugin, "cpufreq", sizeof (vl.plugin));
68 sstrncpy (vl.type, "cpufreq", sizeof (vl.type));
69 ssnprintf (vl.type_instance, sizeof (vl.type_instance), "%i", cpu_num);
71 plugin_dispatch_values (&vl);
74 static int cpufreq_read (void)
76 for (int i = 0; i < num_cpu; i++)
78 char filename[PATH_MAX];
79 ssnprintf (filename, sizeof (filename),
80 "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_cur_freq", i);
83 if (parse_value_file (filename, &v, DS_TYPE_GAUGE) != 0)
85 WARNING ("cpufreq plugin: Reading \"%s\" failed.", filename);
89 /* convert kHz to Hz */
92 cpufreq_submit (i, v);
96 } /* int cpufreq_read */
98 void module_register (void)
100 plugin_register_init ("cpufreq", cpufreq_init);
101 plugin_register_read ("cpufreq", cpufreq_read);