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