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 #if IRQ_HAVE_READ
40 static const char *config_keys[] =
41 {
42 "Irq",
43 "IgnoreSelected"
44 };
45 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
47 static unsigned int *irq_list;
48 static unsigned int irq_list_num;
50 /*
51 * irq_list_action:
52 * 0 => default is to collect selected irqs
53 * 1 => ignore selcted irqs
54 */
55 static int irq_list_action;
57 static int irq_config (const char *key, const char *value)
58 {
59 if (strcasecmp (key, "Irq") == 0)
60 {
61 unsigned int *temp;
62 unsigned int irq;
63 char *endptr;
65 temp = (unsigned int *) realloc (irq_list, (irq_list_num + 1) * sizeof (unsigned int *));
66 if (temp == NULL)
67 {
68 fprintf (stderr, "irq plugin: Cannot allocate more memory.\n");
69 ERROR ("irq plugin: Cannot allocate more memory.");
70 return (1);
71 }
72 irq_list = temp;
74 /* Clear errno, because we need it to see if an error occured. */
75 errno = 0;
77 irq = strtol(value, &endptr, 10);
78 if ((endptr == value) || (errno != 0))
79 {
80 fprintf (stderr, "irq plugin: Irq value is not a "
81 "number: `%s'\n", value);
82 ERROR ("irq plugin: Irq value is not a "
83 "number: `%s'", value);
84 return (1);
85 }
86 irq_list[irq_list_num] = irq;
87 irq_list_num++;
88 }
89 else if (strcasecmp (key, "IgnoreSelected") == 0)
90 {
91 if ((strcasecmp (value, "True") == 0)
92 || (strcasecmp (value, "Yes") == 0)
93 || (strcasecmp (value, "On") == 0))
94 irq_list_action = 1;
95 else
96 irq_list_action = 0;
97 }
98 else
99 {
100 return (-1);
101 }
102 return (0);
103 }
105 /*
106 * Check if this interface/instance should be ignored. This is called from
107 * both, `submit' and `write' to give client and server the ability to
108 * ignore certain stuff..
109 */
110 static int check_ignore_irq (const unsigned int irq)
111 {
112 int i;
114 if (irq_list_num < 1)
115 return (0);
117 for (i = 0; i < irq_list_num; i++)
118 if (irq == irq_list[i])
119 return (irq_list_action);
121 return (1 - irq_list_action);
122 }
124 static void irq_submit (unsigned int irq, counter_t value)
125 {
126 value_t values[1];
127 value_list_t vl = VALUE_LIST_INIT;
128 int status;
130 if (check_ignore_irq (irq))
131 return;
133 values[0].counter = value;
135 vl.values = values;
136 vl.values_len = 1;
137 vl.time = time (NULL);
138 strcpy (vl.host, hostname_g);
139 strcpy (vl.plugin, "irq");
141 status = snprintf (vl.type_instance, sizeof (vl.type_instance),
142 "%u", irq);
143 if ((status < 1) || (status >= sizeof (vl.type_instance)))
144 return;
146 plugin_dispatch_values ("irq", &vl);
147 } /* void irq_submit */
149 static int irq_read (void)
150 {
151 #if KERNEL_LINUX
153 #undef BUFSIZE
154 #define BUFSIZE 256
156 FILE *fh;
157 char buffer[BUFSIZE];
158 unsigned int irq;
159 unsigned int irq_value;
160 long value;
161 char *endptr;
162 int i;
164 char *fields[64];
165 int fields_num;
167 if ((fh = fopen ("/proc/interrupts", "r")) == NULL)
168 {
169 char errbuf[1024];
170 WARNING ("irq plugin: fopen (/proc/interrupts): %s",
171 sstrerror (errno, errbuf, sizeof (errbuf)));
172 return (-1);
173 }
174 while (fgets (buffer, BUFSIZE, fh) != NULL)
175 {
176 fields_num = strsplit (buffer, fields, 64);
177 if (fields_num < 2)
178 continue;
180 errno = 0; /* To distinguish success/failure after call */
181 irq = strtol (fields[0], &endptr, 10);
183 if ((endptr == fields[0]) || (errno != 0) || (*endptr != ':'))
184 continue;
186 irq_value = 0;
187 for (i = 1; i < fields_num; i++)
188 {
189 errno = 0;
190 value = strtol (fields[i], &endptr, 10);
192 if ((*endptr != '\0') || (errno != 0))
193 break;
195 irq_value += value;
196 } /* for (i) */
198 irq_submit (irq, irq_value);
199 }
200 fclose (fh);
201 #endif /* KERNEL_LINUX */
203 return (0);
204 } /* int irq_read */
205 #endif /* IRQ_HAVE_READ */
207 void module_register (void)
208 {
209 #if IRQ_HAVE_READ
210 plugin_register_config ("irq", irq_config,
211 config_keys, config_keys_num);
212 plugin_register_read ("irq", irq_read);
213 #endif /* IRQ_HAVE_READ */
214 } /* void module_register */
216 #undef BUFSIZE