0fc8f2c5281a67414fb16d3ef5b8c054bc4cf25b
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 **/
23 #include "collectd.h"
24 #include "common.h"
25 #include "plugin.h"
27 #define MODULE_NAME "tape"
29 #if defined(HAVE_LIBKSTAT)
30 # define TAPE_HAVE_READ 1
31 #else
32 # define TAPE_HAVE_READ 0
33 #endif
35 static char *tape_filename_template = "tape-%s.rrd";
37 /* 104857600 == 100 MB */
38 static char *tape_ds_def[] =
39 {
40 "DS:rcount:COUNTER:25:0:U",
41 "DS:rmerged:COUNTER:25:0:U",
42 "DS:rbytes:COUNTER:25:0:U",
43 "DS:rtime:COUNTER:25:0:U",
44 "DS:wcount:COUNTER:25:0:U",
45 "DS:wmerged:COUNTER:25:0:U",
46 "DS:wbytes:COUNTER:25:0:U",
47 "DS:wtime:COUNTER:25:0:U",
48 NULL
49 };
50 static int tape_ds_num = 8;
52 #if defined(HAVE_LIBKSTAT)
53 #define MAX_NUMTAPE 256
54 extern kstat_ctl_t *kc;
55 static kstat_t *ksp[MAX_NUMTAPE];
56 static int numtape = 0;
57 #endif /* HAVE_LIBKSTAT */
59 static void tape_init (void)
60 {
61 #ifdef HAVE_LIBKSTAT
62 kstat_t *ksp_chain;
64 numtape = 0;
66 if (kc == NULL)
67 return;
69 for (numtape = 0, ksp_chain = kc->kc_chain;
70 (numtape < MAX_NUMTAPE) && (ksp_chain != NULL);
71 ksp_chain = ksp_chain->ks_next)
72 {
73 if (strncmp (ksp_chain->ks_class, "tape", 4) )
74 continue;
75 if (ksp_chain->ks_type != KSTAT_TYPE_IO)
76 continue;
77 ksp[numtape++] = ksp_chain;
78 }
79 #endif
81 return;
82 }
84 static void tape_write (char *host, char *inst, char *val)
85 {
86 char file[512];
87 int status;
89 status = snprintf (file, 512, tape_filename_template, inst);
90 if (status < 1)
91 return;
92 else if (status >= 512)
93 return;
95 rrd_update_file (host, file, val, tape_ds_def, tape_ds_num);
96 }
99 #define BUFSIZE 512
100 static void tape_submit (char *tape_name,
101 unsigned long long read_count,
102 unsigned long long read_merged,
103 unsigned long long read_bytes,
104 unsigned long long read_time,
105 unsigned long long write_count,
106 unsigned long long write_merged,
107 unsigned long long write_bytes,
108 unsigned long long write_time)
110 {
111 char buf[BUFSIZE];
113 if (snprintf (buf, BUFSIZE, "%u:%llu:%llu:%llu:%llu:%llu:%llu:%llu:%llu",
114 (unsigned int) curtime,
115 read_count, read_merged, read_bytes, read_time,
116 write_count, write_merged, write_bytes,
117 write_time) >= BUFSIZE)
118 return;
120 plugin_submit (MODULE_NAME, tape_name, buf);
121 }
123 #undef BUFSIZE
125 #if TAPE_HAVE_READ
126 static void tape_read (void)
127 {
129 #if defined(HAVE_LIBKSTAT)
130 static kstat_io_t kio;
131 int i;
133 if (kc == NULL)
134 return;
136 for (i = 0; i < numtape; i++)
137 {
138 if (kstat_read (kc, ksp[i], &kio) == -1)
139 continue;
141 if (strncmp (ksp[i]->ks_class, "tape", 4) == 0)
142 tape_submit (ksp[i]->ks_name,
143 kio.reads, 0LL, kio.nread, kio.rtime,
144 kio.writes, 0LL, kio.nwritten, kio.wtime);
145 }
146 #endif /* defined(HAVE_LIBKSTAT) */
147 }
148 #else
149 # define tape_read NULL
150 #endif /* TAPE_HAVE_READ */
152 void module_register (void)
153 {
154 plugin_register (MODULE_NAME, tape_init, tape_read, tape_write);
155 }
157 #undef MODULE_NAME