src/sensors.c

   1 /**
   2  * collectd - src/sensors.c
   3  * Copyright (C) 2005  Florian octo Forster
   4  *
   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.
   9  *
  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.
  14  *
  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
  18  *
  19  * Authors:
  20  *   Florian octo Forster <octo at verplant.org>
  21  **/
  22
  23 #include "collectd.h"
  24 #include "common.h"
  25 #include "plugin.h"
  26
  27 #define MODULE_NAME "sensors"
  28
  29 #if defined(HAVE_SENSORS_SENSORS_H)
  30 # include <sensors/sensors.h>
  31 #else
  32 # undef HAVE_LIBSENSORS
  33 #endif
  34
  35 #if defined(HAVE_LIBSENSORS)
  36 # define SENSORS_HAVE_READ 1
  37 #else
  38 # define SENSORS_HAVE_READ 0
  39 #endif
  40
  41 static char *filename_format = "sensors-%s.rrd";
  42
  43 static char *ds_def[] =
  44 {
  45         "DS:value:GAUGE:25:U:U",
  46         NULL
  47 };
  48 static int ds_num = 1;
  49
  50 #ifdef HAVE_LIBSENSORS
  51 typedef struct featurelist
  52 {
  53         const sensors_chip_name    *chip;
  54         const sensors_feature_data *data;
  55         struct featurelist         *next;
  56 } featurelist_t;
  57
  58 featurelist_t *first_feature = NULL;
  59 #endif /* defined (HAVE_LIBSENSORS) */
  60
  61 static void collectd_sensors_init (void)
  62 {
  63 #ifdef HAVE_LIBSENSORS
  64         FILE *fh;
  65         featurelist_t *last_feature = NULL;
  66         featurelist_t *new_feature;
  67
  68         const sensors_chip_name *chip;
  69         int chip_num;
  70
  71         const sensors_feature_data *data;
  72         int data_num0, data_num1;
  73
  74         new_feature = first_feature;
  75         while (new_feature != NULL)
  76         {
  77                 last_feature = new_feature->next;
  78                 free (new_feature);
  79                 new_feature = last_feature;
  80         }
  81
  82 #ifdef assert
  83         assert (new_feature == NULL);
  84         assert (last_feature == NULL);
  85 #endif
  86
  87         if ((fh = fopen ("/etc/sensors.conf", "r")) == NULL)
  88                 return;
  89
  90         if (sensors_init (fh))
  91         {
  92                 fclose (fh);
  93                 syslog (LOG_ERR, "sensors: Cannot initialize sensors. Data will not be collected.");
  94                 return;
  95         }
  96
  97         fclose (fh);
  98
  99         chip_num = 0;
 100         while ((chip = sensors_get_detected_chips (&chip_num)) != NULL)
 101         {
 102                 data = NULL;
 103                 data_num0 = data_num1 = 0;
 104
 105                 while ((data = sensors_get_all_features (*chip, &data_num0, &data_num1)) != NULL)
 106                 {
 107                         /* "master features" only */
 108                         if (data->mapping != SENSORS_NO_MAPPING)
 109                                 continue;
 110
 111                         /* Only temperature for now.. */
 112                         if (strncmp (data->name, "temp", 4)
 113                                         && strncmp (data->name, "fan", 3))
 114                                 continue;
 115
 116                         if ((new_feature = (featurelist_t *) malloc (sizeof (featurelist_t))) == NULL)
 117                         {
 118                                 perror ("malloc");
 119                                 continue;
 120                         }
 121
 122                         /*
 123                         syslog (LOG_INFO, "sensors: Adding feature: %s/%s", chip->prefix, data->name);
 124                         */
 125
 126                         new_feature->chip = chip;
 127                         new_feature->data = data;
 128                         new_feature->next = NULL;
 129
 130                         if (first_feature == NULL)
 131                         {
 132                                 first_feature = new_feature;
 133                                 last_feature  = new_feature;
 134                         }
 135                         else
 136                         {
 137                                 last_feature->next = new_feature;
 138                                 last_feature = new_feature;
 139                         }
 140                 }
 141         }
 142
 143         if (first_feature == NULL)
 144                 sensors_cleanup ();
 145 #endif /* defined(HAVE_LIBSENSORS) */
 146
 147         return;
 148 }
 149
 150 #define BUFSIZE 512
 151 static void sensors_write (char *host, char *inst, char *val)
 152 {
 153         char file[BUFSIZE];
 154         int status;
 155
 156         status = snprintf (file, BUFSIZE, filename_format, inst);
 157         if (status < 1)
 158                 return;
 159         else if (status >= BUFSIZE)
 160                 return;
 161
 162         rrd_update_file (host, file, val, ds_def, ds_num);
 163 }
 164
 165 static void sensors_submit (const char *feat_name, const char *chip_prefix, double value)
 166 {
 167         char buf[BUFSIZE];
 168         char inst[BUFSIZE];
 169
 170         if (snprintf (buf, BUFSIZE, "%u:%.3f", (unsigned int) curtime, value) >= BUFSIZE)
 171                 return;
 172
 173         if (snprintf (inst, BUFSIZE, "%s-%s", chip_prefix, feat_name) >= BUFSIZE)
 174                 return;
 175
 176         plugin_submit (MODULE_NAME, inst, buf);
 177 }
 178 #undef BUFSIZE
 179
 180 #if SENSORS_HAVE_READ
 181 static void sensors_read (void)
 182 {
 183         featurelist_t *feature;
 184         double value;
 185
 186         for (feature = first_feature; feature != NULL; feature = feature->next)
 187         {
 188                 if (sensors_get_feature (*feature->chip, feature->data->number, &value) < 0)
 189                         continue;
 190
 191                 sensors_submit (feature->data->name, feature->chip->prefix, value);
 192         }
 193 }
 194 #endif /* SENSORS_HAVE_READ */
 195
 196 void module_register (void)
 197 {
 198         plugin_register (MODULE_NAME, collectd_sensors_init,
 199 #if SENSORS_HAVE_READ
 200                         sensors_read,
 201 #else
 202                         NULL,
 203 #endif
 204                         sensors_write);
 205 }
 206
 207 #undef MODULE_NAME