1 /**
2 * collectd - src/irq.c
3 * Copyright (C) 2007 Peter Holik
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 * Peter Holik <peter at holik.at>
21 **/
23 #include "collectd.h"
24 #include "common.h"
25 #include "plugin.h"
26 #include "configfile.h"
28 #if !KERNEL_LINUX
29 # error "No applicable input method."
30 #endif
32 /*
33 * (Module-)Global variables
34 */
35 static const char *config_keys[] =
36 {
37 "Irq",
38 "IgnoreSelected"
39 };
40 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
42 static char **irq_list;
43 static unsigned int irq_list_num = 0;
45 /*
46 * irq_list_action:
47 * 0 => default is to collect selected irqs
48 * 1 => ignore selcted irqs
49 */
50 static int irq_list_action;
52 static int irq_config (const char *key, const char *value)
53 {
54 if (strcasecmp (key, "Irq") == 0)
55 {
56 char **temp;
58 temp = realloc (irq_list, (irq_list_num + 1) * sizeof (*irq_list));
59 if (temp == NULL)
60 {
61 fprintf (stderr, "irq plugin: Cannot allocate more memory.\n");
62 ERROR ("irq plugin: Cannot allocate more memory.");
63 return (1);
64 }
65 irq_list = temp;
67 irq_list[irq_list_num] = strdup (value);
68 if (irq_list[irq_list_num] == NULL)
69 {
70 ERROR ("irq plugin: strdup(3) failed.");
71 return (1);
72 }
74 irq_list_num++;
75 }
76 else if (strcasecmp (key, "IgnoreSelected") == 0)
77 {
78 if (IS_TRUE (value))
79 irq_list_action = 1;
80 else
81 irq_list_action = 0;
82 }
83 else
84 {
85 return (-1);
86 }
87 return (0);
88 }
90 /*
91 * Check if this interface/instance should be ignored. This is called from
92 * both, `submit' and `write' to give client and server the ability to
93 * ignore certain stuff..
94 */
95 static int check_ignore_irq (const char *irq)
96 {
97 unsigned int i;
99 if (irq_list_num < 1)
100 return (0);
102 for (i = 0; i < irq_list_num; i++)
103 if (strcmp (irq, irq_list[i]) == 0)
104 return (irq_list_action);
106 return (1 - irq_list_action);
107 }
109 static void irq_submit (const char *irq_name, derive_t value)
110 {
111 value_t values[1];
112 value_list_t vl = VALUE_LIST_INIT;
114 if (check_ignore_irq (irq_name))
115 return;
117 values[0].derive = value;
119 vl.values = values;
120 vl.values_len = 1;
121 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
122 sstrncpy (vl.plugin, "irq", sizeof (vl.plugin));
123 sstrncpy (vl.type, "irq", sizeof (vl.type));
124 sstrncpy (vl.type_instance, irq_name, sizeof (vl.type_instance));
126 plugin_dispatch_values (&vl);
127 } /* void irq_submit */
129 static int irq_read (void)
130 {
131 FILE *fh;
132 char buffer[1024];
134 fh = fopen ("/proc/interrupts", "r");
135 if (fh == NULL)
136 {
137 char errbuf[1024];
138 ERROR ("irq plugin: fopen (/proc/interrupts): %s",
139 sstrerror (errno, errbuf, sizeof (errbuf)));
140 return (-1);
141 }
143 while (fgets (buffer, sizeof (buffer), fh) != NULL)
144 {
145 char *irq_name;
146 size_t irq_name_len;
147 derive_t irq_value;
148 int i;
150 char *fields[64];
151 int fields_num;
153 fields_num = strsplit (buffer, fields, 64);
154 if (fields_num < 2)
155 continue;
157 irq_name = fields[0];
158 irq_name_len = strlen (irq_name);
159 if (irq_name_len < 2)
160 continue;
162 /* Check if irq name ends with colon.
163 * Otherwise it's a header. */
164 if (irq_name[irq_name_len - 1] != ':')
165 continue;
167 irq_name[irq_name_len - 1] = 0;
168 irq_name_len--;
170 irq_value = 0;
171 for (i = 1; i < fields_num; i++)
172 {
173 /* Per-CPU value */
174 value_t v;
175 int status;
177 status = parse_value (fields[i], &v, DS_TYPE_DERIVE);
178 if (status != 0)
179 break;
181 irq_value += v.derive;
182 } /* for (i) */
184 /* No valid fields -> do not submit anything. */
185 if (i <= 1)
186 continue;
188 irq_submit (irq_name, irq_value);
189 }
191 fclose (fh);
193 return (0);
194 } /* int irq_read */
196 void module_register (void)
197 {
198 plugin_register_config ("irq", irq_config,
199 config_keys, config_keys_num);
200 plugin_register_read ("irq", irq_read);
201 } /* void module_register */