1 /**
2 * collectd - src/irq.c
3 * Copyright (C) 2007 Peter Holik
4 * Copyright (C) 2011 Florian Forster
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 *
20 * Authors:
21 * Peter Holik <peter at holik.at>
22 **/
24 #include "collectd.h"
26 #include "common.h"
27 #include "plugin.h"
28 #include "configfile.h"
29 #include "utils_ignorelist.h"
31 #if !KERNEL_LINUX
32 # error "No applicable input method."
33 #endif
35 /*
36 * (Module-)Global variables
37 */
38 static const char *config_keys[] =
39 {
40 "Irq",
41 "IgnoreSelected"
42 };
43 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
45 static ignorelist_t *ignorelist = NULL;
47 /*
48 * Private functions
49 */
50 static int irq_config (const char *key, const char *value)
51 {
52 if (ignorelist == NULL)
53 ignorelist = ignorelist_create (/* invert = */ 1);
55 if (strcasecmp (key, "Irq") == 0)
56 {
57 ignorelist_add (ignorelist, value);
58 }
59 else if (strcasecmp (key, "IgnoreSelected") == 0)
60 {
61 int invert = 1;
62 if (IS_TRUE (value))
63 invert = 0;
64 ignorelist_set_invert (ignorelist, invert);
65 }
66 else
67 {
68 return (-1);
69 }
71 return (0);
72 }
74 static void irq_submit (const char *irq_name, derive_t value)
75 {
76 value_t values[1];
77 value_list_t vl = VALUE_LIST_INIT;
79 if (ignorelist_match (ignorelist, irq_name) != 0)
80 return;
82 values[0].derive = value;
84 vl.values = values;
85 vl.values_len = 1;
86 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
87 sstrncpy (vl.plugin, "irq", sizeof (vl.plugin));
88 sstrncpy (vl.type, "irq", sizeof (vl.type));
89 sstrncpy (vl.type_instance, irq_name, sizeof (vl.type_instance));
91 plugin_dispatch_values (&vl);
92 } /* void irq_submit */
94 static int irq_read (void)
95 {
96 FILE *fh;
97 char buffer[1024];
98 int cpu_count;
99 char *fields[256];
101 /*
102 * Example content:
103 * CPU0 CPU1 CPU2 CPU3
104 * 0: 2574 1 3 2 IO-APIC-edge timer
105 * 1: 102553 158669 218062 70587 IO-APIC-edge i8042
106 * 8: 0 0 0 1 IO-APIC-edge rtc0
107 */
108 fh = fopen ("/proc/interrupts", "r");
109 if (fh == NULL)
110 {
111 char errbuf[1024];
112 ERROR ("irq plugin: fopen (/proc/interrupts): %s",
113 sstrerror (errno, errbuf, sizeof (errbuf)));
114 return (-1);
115 }
117 /* Get CPU count from the first line */
118 if(fgets (buffer, sizeof (buffer), fh) != NULL) {
119 cpu_count = strsplit (buffer, fields,
120 STATIC_ARRAY_SIZE (fields));
121 } else {
122 ERROR ("irq plugin: unable to get CPU count from first line "
123 "of /proc/interrupts");
124 fclose (fh);
125 return (-1);
126 }
128 while (fgets (buffer, sizeof (buffer), fh) != NULL)
129 {
130 char *irq_name;
131 size_t irq_name_len;
132 derive_t irq_value;
133 int i;
134 int fields_num;
135 int irq_values_to_parse;
137 fields_num = strsplit (buffer, fields,
138 STATIC_ARRAY_SIZE (fields));
139 if (fields_num < 2)
140 continue;
142 /* Parse this many numeric fields, skip the rest
143 * (+1 because first there is a name of irq in each line) */
144 if (fields_num >= cpu_count + 1)
145 irq_values_to_parse = cpu_count;
146 else
147 irq_values_to_parse = fields_num - 1;
149 /* First field is irq name and colon */
150 irq_name = fields[0];
151 irq_name_len = strlen (irq_name);
152 if (irq_name_len < 2)
153 continue;
155 /* Check if irq name ends with colon.
156 * Otherwise it's a header. */
157 if (irq_name[irq_name_len - 1] != ':')
158 continue;
160 /* Is it the the ARM fast interrupt (FIQ)? */
161 if (irq_name_len == 4 && (strncmp(irq_name, "FIQ:", 4) == 0))
162 continue;
164 irq_name[irq_name_len - 1] = 0;
165 irq_name_len--;
167 irq_value = 0;
168 for (i = 1; i <= irq_values_to_parse; i++)
169 {
170 /* Per-CPU value */
171 value_t v;
172 int status;
174 status = parse_value (fields[i], &v, DS_TYPE_DERIVE);
175 if (status != 0)
176 break;
178 irq_value += v.derive;
179 } /* for (i) */
181 /* No valid fields -> do not submit anything. */
182 if (i <= 1)
183 continue;
185 irq_submit (irq_name, irq_value);
186 }
188 fclose (fh);
190 return (0);
191 } /* int irq_read */
193 void module_register (void)
194 {
195 plugin_register_config ("irq", irq_config,
196 config_keys, config_keys_num);
197 plugin_register_read ("irq", irq_read);
198 } /* void module_register */