1 /**
2 * collectd - src/tape.c
3 * Copyright (C) 2005,2006 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"
25 #include "common.h"
26 #include "plugin.h"
28 #if !HAVE_LIBKSTAT
29 # error "No applicable input method."
30 #endif
32 #define MAX_NUMTAPE 256
33 extern kstat_ctl_t *kc;
34 static kstat_t *ksp[MAX_NUMTAPE];
35 static int numtape = 0;
37 static int tape_init (void)
38 {
39 kstat_t *ksp_chain;
41 numtape = 0;
43 if (kc == NULL)
44 return (-1);
46 for (numtape = 0, ksp_chain = kc->kc_chain;
47 (numtape < MAX_NUMTAPE) && (ksp_chain != NULL);
48 ksp_chain = ksp_chain->ks_next)
49 {
50 if (strncmp (ksp_chain->ks_class, "tape", 4) )
51 continue;
52 if (ksp_chain->ks_type != KSTAT_TYPE_IO)
53 continue;
54 ksp[numtape++] = ksp_chain;
55 }
57 return (0);
58 } /* int tape_init */
60 static void tape_submit (const char *plugin_instance,
61 const char *type,
62 derive_t read, derive_t write)
63 {
64 value_list_t vl = VALUE_LIST_INIT;
65 value_t values[] = {
66 { .derive = read },
67 { .derive = write },
68 };
70 vl.values = values;
71 vl.values_len = STATIC_ARRAY_SIZE (values);
72 sstrncpy (vl.plugin, "tape", sizeof (vl.plugin));
73 sstrncpy (vl.plugin_instance, plugin_instance,
74 sizeof (vl.plugin_instance));
75 sstrncpy (vl.type, type, sizeof (vl.type));
77 plugin_dispatch_values (&vl);
78 } /* void tape_submit */
80 static int tape_read (void)
81 {
83 #if HAVE_KSTAT_IO_T_WRITES && HAVE_KSTAT_IO_T_NWRITES && HAVE_KSTAT_IO_T_WTIME
84 # define KIO_ROCTETS reads
85 # define KIO_WOCTETS writes
86 # define KIO_ROPS nreads
87 # define KIO_WOPS nwrites
88 # define KIO_RTIME rtime
89 # define KIO_WTIME wtime
90 #elif HAVE_KSTAT_IO_T_NWRITTEN && HAVE_KSTAT_IO_T_WRITES && HAVE_KSTAT_IO_T_WTIME
91 # define KIO_ROCTETS nread
92 # define KIO_WOCTETS nwritten
93 # define KIO_ROPS reads
94 # define KIO_WOPS writes
95 # define KIO_RTIME rtime
96 # define KIO_WTIME wtime
97 #else
98 # error "kstat_io_t does not have the required members"
99 #endif
100 static kstat_io_t kio;
102 if (kc == NULL)
103 return (-1);
105 if (numtape <= 0)
106 return (-1);
108 for (int i = 0; i < numtape; i++)
109 {
110 if (kstat_read (kc, ksp[i], &kio) == -1)
111 continue;
113 if (strncmp (ksp[i]->ks_class, "tape", 4) == 0)
114 {
115 tape_submit (ksp[i]->ks_name, "tape_octets",
116 kio.KIO_ROCTETS, kio.KIO_WOCTETS);
117 tape_submit (ksp[i]->ks_name, "tape_ops",
118 kio.KIO_ROPS, kio.KIO_WOPS);
119 /* FIXME: Convert this to microseconds if necessary */
120 tape_submit (ksp[i]->ks_name, "tape_time",
121 kio.KIO_RTIME, kio.KIO_WTIME);
122 }
123 }
125 return (0);
126 }
128 void module_register (void)
129 {
130 plugin_register_init ("tape", tape_init);
131 plugin_register_read ("tape", tape_read);
132 }