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/**
* collectd - src/cpufreq.c
* Copyright (C) 2005-2007 Peter Holik
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Authors:
* Peter Holik <peter at holik.at>
**/
#include "collectd.h"
#include "common.h"
#include "plugin.h"
#define MODULE_NAME "cpufreq"
static int num_cpu = 0;
static int cpufreq_init (void)
{
int status;
char filename[256];
num_cpu = 0;
while (1)
{
status = ssnprintf (filename, sizeof (filename),
"/sys/devices/system/cpu/cpu%d/cpufreq/"
"scaling_cur_freq", num_cpu);
if ((status < 1) || ((unsigned int)status >= sizeof (filename)))
break;
if (access (filename, R_OK))
break;
num_cpu++;
}
INFO ("cpufreq plugin: Found %d CPU%s", num_cpu,
(num_cpu == 1) ? "" : "s");
if (num_cpu == 0)
plugin_unregister_read ("cpufreq");
return (0);
} /* int cpufreq_init */
static void cpufreq_submit (int cpu_num, double value)
{
value_t values[1];
value_list_t vl = VALUE_LIST_INIT;
values[0].gauge = value;
vl.values = values;
vl.values_len = 1;
sstrncpy (vl.host, hostname_g, sizeof (vl.host));
sstrncpy (vl.plugin, "cpufreq", sizeof (vl.plugin));
sstrncpy (vl.type, "cpufreq", sizeof (vl.type));
ssnprintf (vl.type_instance, sizeof (vl.type_instance),
"%i", cpu_num);
plugin_dispatch_values (&vl);
}
static int cpufreq_read (void)
{
int status;
unsigned long long val;
int i = 0;
FILE *fp;
char filename[256];
char buffer[16];
for (i = 0; i < num_cpu; i++)
{
status = ssnprintf (filename, sizeof (filename),
"/sys/devices/system/cpu/cpu%d/cpufreq/"
"scaling_cur_freq", i);
if ((status < 1) || ((unsigned int)status >= sizeof (filename)))
return (-1);
if ((fp = fopen (filename, "r")) == NULL)
{
char errbuf[1024];
WARNING ("cpufreq: fopen (%s): %s", filename,
sstrerror (errno, errbuf,
sizeof (errbuf)));
return (-1);
}
if (fgets (buffer, 16, fp) == NULL)
{
char errbuf[1024];
WARNING ("cpufreq: fgets: %s",
sstrerror (errno, errbuf,
sizeof (errbuf)));
fclose (fp);
return (-1);
}
if (fclose (fp))
{
char errbuf[1024];
WARNING ("cpufreq: fclose: %s",
sstrerror (errno, errbuf,
sizeof (errbuf)));
}
/* You're seeing correctly: The file is reporting kHz values.. */
val = atoll (buffer) * 1000;
cpufreq_submit (i, val);
}
return (0);
} /* int cpufreq_read */
void module_register (void)
{
plugin_register_init ("cpufreq", cpufreq_init);
plugin_register_read ("cpufreq", cpufreq_read);
}
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