src/tape.c

   1 /**
   2  * collectd - src/tape.c
   3  * Copyright (C) 2005  Scott Garrett
   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  *   Scott Garrett <sgarrett at technomancer.com>
  21  **/
  22
  23 #include "tape.h"
  24
  25 #if COLLECT_TAPE
  26 #define MODULE_NAME "tape"
  27
  28 #include "plugin.h"
  29 #include "common.h"
  30
  31 #if defined(HAVE_LIBKSTAT)
  32 #define MAX_NUMTAPE 256
  33 extern kstat_ctl_t *kc;
  34 static kstat_t *ksp[MAX_NUMTAPE];
  35 static int numtape = 0;
  36 #endif /* HAVE_LIBKSTAT */
  37
  38 static char *tape_filename_template = "tape-%s.rrd";
  39
  40 /* 104857600 == 100 MB */
  41 static char *tape_ds_def[] =
  42 {
  43         "DS:rcount:COUNTER:25:0:U",
  44         "DS:rmerged:COUNTER:25:0:U",
  45         "DS:rbytes:COUNTER:25:0:U",
  46         "DS:rtime:COUNTER:25:0:U",
  47         "DS:wcount:COUNTER:25:0:U",
  48         "DS:wmerged:COUNTER:25:0:U",
  49         "DS:wbytes:COUNTER:25:0:U",
  50         "DS:wtime:COUNTER:25:0:U",
  51         NULL
  52 };
  53 static int tape_ds_num = 8;
  54
  55 extern time_t curtime;
  56
  57 void tape_init (void)
  58 {
  59 #ifdef HAVE_LIBKSTAT
  60         kstat_t *ksp_chain;
  61
  62         numtape = 0;
  63
  64         if (kc == NULL)
  65                 return;
  66
  67         for (numtape = 0, ksp_chain = kc->kc_chain;
  68                         (numtape < MAX_NUMTAPE) && (ksp_chain != NULL);
  69                         ksp_chain = ksp_chain->ks_next)
  70         {
  71                 if (strncmp (ksp_chain->ks_class, "tape", 4) )
  72                         continue;
  73                 if (ksp_chain->ks_type != KSTAT_TYPE_IO)
  74                         continue;
  75                 ksp[numtape++] = ksp_chain;
  76         }
  77 #endif
  78
  79         return;
  80 }
  81
  82 void tape_write (char *host, char *inst, char *val)
  83 {
  84         char file[512];
  85         int status;
  86
  87         status = snprintf (file, 512, tape_filename_template, inst);
  88         if (status < 1)
  89                 return;
  90         else if (status >= 512)
  91                 return;
  92
  93         rrd_update_file (host, file, val, tape_ds_def, tape_ds_num);
  94 }
  95
  96
  97 #define BUFSIZE 512
  98 void tape_submit (char *tape_name,
  99                 unsigned long long read_count,
 100                 unsigned long long read_merged,
 101                 unsigned long long read_bytes,
 102                 unsigned long long read_time,
 103                 unsigned long long write_count,
 104                 unsigned long long write_merged,
 105                 unsigned long long write_bytes,
 106                 unsigned long long write_time)
 107
 108 {
 109         char buf[BUFSIZE];
 110
 111         if (snprintf (buf, BUFSIZE, "%u:%llu:%llu:%llu:%llu:%llu:%llu:%llu:%llu",
 112                                 (unsigned int) curtime,
 113                                 read_count, read_merged, read_bytes, read_time,
 114                                 write_count, write_merged, write_bytes,
 115                                 write_time) >= BUFSIZE)
 116                 return;
 117
 118         plugin_submit (MODULE_NAME, tape_name, buf);
 119 }
 120
 121 #undef BUFSIZE
 122
 123 void tape_read (void)
 124 {
 125
 126 #if defined(HAVE_LIBKSTAT)
 127         static kstat_io_t kio;
 128         int i;
 129
 130         if (kc == NULL)
 131                 return;
 132
 133         for (i = 0; i < numtape; i++)
 134         {
 135                 if (kstat_read (kc, ksp[i], &kio) == -1)
 136                         continue;
 137
 138                 if (strncmp (ksp[i]->ks_class, "tape", 4) == 0)
 139                         tape_submit (ksp[i]->ks_name,
 140                                         kio.reads,  0LL, kio.nread,    kio.rtime,
 141                                         kio.writes, 0LL, kio.nwritten, kio.wtime);
 142         }
 143 #endif /* defined(HAVE_LIBKSTAT) */
 144 }
 145
 146 void module_register (void)
 147 {
 148         plugin_register (MODULE_NAME, tape_init, tape_read, tape_write);
 149 }
 150
 151 #undef MODULE_NAME
 152 #endif /* COLLECT_TAPE */