src/sensors.c

   1 /**
   2  * collectd - src/sensors.c
   3  * Copyright (C) 2005,2006  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 #define BUFSIZE 512
  42
  43 static char *filename_format = "sensors-%s.rrd";
  44
  45 static char *ds_def[] =
  46 {
  47         "DS:value:GAUGE:"COLLECTD_HEARTBEAT":U:U",
  48         NULL
  49 };
  50 static int ds_num = 1;
  51
  52 #ifdef HAVE_LIBSENSORS
  53 typedef struct featurelist
  54 {
  55         const sensors_chip_name    *chip;
  56         const sensors_feature_data *data;
  57         struct featurelist         *next;
  58 } featurelist_t;
  59
  60 featurelist_t *first_feature = NULL;
  61 #endif /* defined (HAVE_LIBSENSORS) */
  62
  63 static void collectd_sensors_init (void)
  64 {
  65 #ifdef HAVE_LIBSENSORS
  66         FILE *fh;
  67         featurelist_t *last_feature = NULL;
  68         featurelist_t *new_feature;
  69
  70         const sensors_chip_name *chip;
  71         int chip_num;
  72
  73         const sensors_feature_data *data;
  74         int data_num0, data_num1;
  75
  76         new_feature = first_feature;
  77         while (new_feature != NULL)
  78         {
  79                 last_feature = new_feature->next;
  80                 free (new_feature);
  81                 new_feature = last_feature;
  82         }
  83
  84 #ifdef assert
  85         assert (new_feature == NULL);
  86         assert (last_feature == NULL);
  87 #endif
  88
  89         if ((fh = fopen ("/etc/sensors.conf", "r")) == NULL)
  90                 return;
  91
  92         if (sensors_init (fh))
  93         {
  94                 fclose (fh);
  95                 syslog (LOG_ERR, "sensors: Cannot initialize sensors. Data will not be collected.");
  96                 return;
  97         }
  98
  99         fclose (fh);
 100
 101         chip_num = 0;
 102         while ((chip = sensors_get_detected_chips (&chip_num)) != NULL)
 103         {
 104                 data = NULL;
 105                 data_num0 = data_num1 = 0;
 106
 107                 while ((data = sensors_get_all_features (*chip, &data_num0, &data_num1)) != NULL)
 108                 {
 109                         /* "master features" only */
 110                         if (data->mapping != SENSORS_NO_MAPPING)
 111                                 continue;
 112
 113                         /* Only temperature for now.. */
 114                         if (strncmp (data->name, "temp", 4)
 115                                         && strncmp (data->name, "fan", 3))
 116                                 continue;
 117
 118                         if ((new_feature = (featurelist_t *) malloc (sizeof (featurelist_t))) == NULL)
 119                         {
 120                                 perror ("malloc");
 121                                 continue;
 122                         }
 123
 124                         /*
 125                         syslog (LOG_INFO, "sensors: Adding feature: %s/%s", chip->prefix, data->name);
 126                         */
 127
 128                         new_feature->chip = chip;
 129                         new_feature->data = data;
 130                         new_feature->next = NULL;
 131
 132                         if (first_feature == NULL)
 133                         {
 134                                 first_feature = new_feature;
 135                                 last_feature  = new_feature;
 136                         }
 137                         else
 138                         {
 139                                 last_feature->next = new_feature;
 140                                 last_feature = new_feature;
 141                         }
 142                 }
 143         }
 144
 145         if (first_feature == NULL)
 146                 sensors_cleanup ();
 147 #endif /* defined(HAVE_LIBSENSORS) */
 148
 149         return;
 150 }
 151
 152 static void sensors_write (char *host, char *inst, char *val)
 153 {
 154         char file[BUFSIZE];
 155         int status;
 156
 157         status = snprintf (file, BUFSIZE, filename_format, inst);
 158         if (status < 1)
 159                 return;
 160         else if (status >= BUFSIZE)
 161                 return;
 162
 163         rrd_update_file (host, file, val, ds_def, ds_num);
 164 }
 165
 166 #if SENSORS_HAVE_READ
 167 static void sensors_submit (const char *feat_name, const char *chip_prefix, double value)
 168 {
 169         char buf[BUFSIZE];
 170         char inst[BUFSIZE];
 171
 172         if (snprintf (buf, BUFSIZE, "%u:%.3f", (unsigned int) curtime, value) >= BUFSIZE)
 173                 return;
 174
 175         if (snprintf (inst, BUFSIZE, "%s-%s", chip_prefix, feat_name) >= BUFSIZE)
 176                 return;
 177
 178         plugin_submit (MODULE_NAME, inst, buf);
 179 }
 180
 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 #else
 195 # define sensors_read NULL
 196 #endif /* SENSORS_HAVE_READ */
 197
 198 void module_register (void)
 199 {
 200         plugin_register (MODULE_NAME, collectd_sensors_init, sensors_read, sensors_write);
 201 }
 202
 203 #undef BUFSIZE
 204 #undef MODULE_NAME