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 # define IRQ_HAVE_READ 1
30 #else
31 # define IRQ_HAVE_READ 0
32 #endif
34 #define BUFSIZE 128
36 /*
37 * (Module-)Global variables
38 */
39 static data_source_t dsrc_irq[1] =
40 {
41 {"value", DS_TYPE_COUNTER, 0, 65535.0}
42 };
44 static data_set_t ds_irq =
45 {
46 "irq", 1, dsrc_irq
47 };
49 #if IRQ_HAVE_READ
50 static const char *config_keys[] =
51 {
52 "Irq",
53 "IgnoreSelected"
54 };
55 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
57 static unsigned int *irq_list;
58 static unsigned int irq_list_num;
60 /*
61 * irq_list_action:
62 * 0 => default is to collect selected irqs
63 * 1 => ignore selcted irqs
64 */
65 static int irq_list_action;
67 static int irq_config (const char *key, const char *value)
68 {
69 if (strcasecmp (key, "Irq") == 0)
70 {
71 unsigned int *temp;
72 unsigned int irq;
73 char *endptr;
75 temp = (unsigned int *) realloc (irq_list, (irq_list_num + 1) * sizeof (unsigned int *));
76 if (temp == NULL)
77 {
78 fprintf (stderr, "irq plugin: Cannot allocate more memory.\n");
79 ERROR ("irq plugin: Cannot allocate more memory.");
80 return (1);
81 }
82 irq_list = temp;
84 /* Clear errno, because we need it to see if an error occured. */
85 errno = 0;
87 irq = strtol(value, &endptr, 10);
88 if ((endptr == value) || (errno != 0))
89 {
90 fprintf (stderr, "irq plugin: Irq value is not a "
91 "number: `%s'\n", value);
92 ERROR ("irq plugin: Irq value is not a "
93 "number: `%s'", value);
94 return (1);
95 }
96 irq_list[irq_list_num] = irq;
97 irq_list_num++;
98 }
99 else if (strcasecmp (key, "IgnoreSelected") == 0)
100 {
101 if ((strcasecmp (value, "True") == 0)
102 || (strcasecmp (value, "Yes") == 0)
103 || (strcasecmp (value, "On") == 0))
104 irq_list_action = 1;
105 else
106 irq_list_action = 0;
107 }
108 else
109 {
110 return (-1);
111 }
112 return (0);
113 }
115 /*
116 * Check if this interface/instance should be ignored. This is called from
117 * both, `submit' and `write' to give client and server the ability to
118 * ignore certain stuff..
119 */
120 static int check_ignore_irq (const unsigned int irq)
121 {
122 int i;
124 if (irq_list_num < 1)
125 return (0);
127 for (i = 0; i < irq_list_num; i++)
128 if (irq == irq_list[i])
129 return (irq_list_action);
131 return (1 - irq_list_action);
132 }
134 static void irq_submit (unsigned int irq, counter_t value)
135 {
136 value_t values[1];
137 value_list_t vl = VALUE_LIST_INIT;
138 int status;
140 if (check_ignore_irq (irq))
141 return;
143 values[0].counter = value;
145 vl.values = values;
146 vl.values_len = 1;
147 vl.time = time (NULL);
148 strcpy (vl.host, hostname_g);
149 strcpy (vl.plugin, "irq");
151 status = snprintf (vl.type_instance, sizeof (vl.type_instance),
152 "%u", irq);
153 if ((status < 1) || (status >= sizeof (vl.type_instance)))
154 return;
156 plugin_dispatch_values ("irq", &vl);
157 } /* void irq_submit */
159 static int irq_read (void)
160 {
161 #if KERNEL_LINUX
163 #undef BUFSIZE
164 #define BUFSIZE 256
166 FILE *fh;
167 char buffer[BUFSIZE];
168 unsigned int irq;
169 unsigned int irq_value;
170 long value;
171 char *endptr;
172 int i;
174 char *fields[64];
175 int fields_num;
177 if ((fh = fopen ("/proc/interrupts", "r")) == NULL)
178 {
179 char errbuf[1024];
180 WARNING ("irq plugin: fopen (/proc/interrupts): %s",
181 sstrerror (errno, errbuf, sizeof (errbuf)));
182 return (-1);
183 }
184 while (fgets (buffer, BUFSIZE, fh) != NULL)
185 {
186 fields_num = strsplit (buffer, fields, 64);
187 if (fields_num < 2)
188 continue;
190 errno = 0; /* To distinguish success/failure after call */
191 irq = strtol (fields[0], &endptr, 10);
193 if ((endptr == fields[0]) || (errno != 0) || (*endptr != ':'))
194 continue;
196 irq_value = 0;
197 for (i = 1; i < fields_num; i++)
198 {
199 errno = 0;
200 value = strtol (fields[i], &endptr, 10);
202 if ((*endptr != '\0') || (errno != 0))
203 break;
205 irq_value += value;
206 } /* for (i) */
208 irq_submit (irq, irq_value);
209 }
210 fclose (fh);
211 #endif /* KERNEL_LINUX */
213 return (0);
214 } /* int irq_read */
215 #endif /* IRQ_HAVE_READ */
217 void module_register (modreg_e load)
218 {
219 if (load & MR_DATASETS)
220 plugin_register_data_set (&ds_irq);
222 #if IRQ_HAVE_READ
223 if (load & MR_READ)
224 {
225 plugin_register_config ("irq", irq_config,
226 config_keys, config_keys_num);
227 plugin_register_read ("irq", irq_read);
228 }
229 #endif /* IRQ_HAVE_READ */
230 } /* void module_register */
232 #undef BUFSIZE