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