1 /**
2 * collectd - src/contextswitch.c
3 * Copyright (C) 2009 Patrik Weiskircher
4 * Copyright (C) 2010 Kimo Rosenbaum
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; only version 2 of the License is applicable.
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 * Patrik Weiskircher <weiskircher at inqnet.at>
21 * Kimo Rosenbaum <http://github.com/kimor79>
22 **/
24 #include "collectd.h"
26 #include "common.h"
27 #include "plugin.h"
29 #ifdef HAVE_SYS_SYSCTL_H
30 # include <sys/sysctl.h>
31 #endif
33 #if HAVE_SYSCTLBYNAME
34 /* no global variables */
35 /* #endif HAVE_SYSCTLBYNAME */
37 #elif KERNEL_LINUX
38 /* no global variables */
39 /* #endif KERNEL_LINUX */
41 #elif HAVE_PERFSTAT
42 # include <sys/protosw.h>
43 # include <libperfstat.h>
44 /* #endif HAVE_PERFSTAT */
46 #else
47 # error "No applicable input method."
48 #endif
50 static void cs_submit (derive_t context_switches)
51 {
52 value_t values[1];
53 value_list_t vl = VALUE_LIST_INIT;
55 values[0].derive = (derive_t) context_switches;
57 vl.values = values;
58 vl.values_len = 1;
59 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
60 sstrncpy (vl.plugin, "contextswitch", sizeof (vl.plugin));
61 sstrncpy (vl.type, "contextswitch", sizeof (vl.type));
63 plugin_dispatch_values (&vl);
64 }
66 static int cs_read (void)
67 {
68 #if HAVE_SYSCTLBYNAME
69 int value = 0;
70 size_t value_len = sizeof (value);
71 int status;
73 status = sysctlbyname ("vm.stats.sys.v_swtch",
74 &value, &value_len,
75 /* new pointer = */ NULL, /* new length = */ 0);
76 if (status != 0)
77 {
78 ERROR("contextswitch plugin: sysctlbyname "
79 "(vm.stats.sys.v_swtch) failed");
80 return (-1);
81 }
83 cs_submit (value);
84 /* #endif HAVE_SYSCTLBYNAME */
86 #elif KERNEL_LINUX
87 FILE *fh;
88 char buffer[64];
89 int numfields;
90 char *fields[3];
91 derive_t result = 0;
92 int status = -2;
94 fh = fopen ("/proc/stat", "r");
95 if (fh == NULL) {
96 ERROR ("contextswitch plugin: unable to open /proc/stat: %s",
97 sstrerror (errno, buffer, sizeof (buffer)));
98 return (-1);
99 }
101 while (fgets(buffer, sizeof(buffer), fh) != NULL)
102 {
103 char *endptr;
105 numfields = strsplit(buffer, fields, STATIC_ARRAY_SIZE (fields));
106 if (numfields != 2)
107 continue;
109 if (strcmp("ctxt", fields[0]) != 0)
110 continue;
112 errno = 0;
113 endptr = NULL;
114 result = (derive_t) strtoll (fields[1], &endptr, /* base = */ 10);
115 if ((endptr == fields[1]) || (errno != 0)) {
116 ERROR ("contextswitch plugin: Cannot parse ctxt value: %s",
117 fields[1]);
118 status = -1;
119 break;
120 }
122 cs_submit(result);
123 status = 0;
124 break;
125 }
126 fclose(fh);
128 if (status == -2)
129 ERROR ("contextswitch plugin: Unable to find context switch value.");
130 /* #endif KERNEL_LINUX */
132 #elif HAVE_PERFSTAT
133 int status = 0;
134 perfstat_cpu_total_t perfcputotal;
136 status = perfstat_cpu_total(NULL, &perfcputotal, sizeof(perfstat_cpu_total_t), 1);
137 if (status < 0)
138 {
139 char errbuf[1024];
140 ERROR ("contextswitch plugin: perfstat_cpu_total: %s",
141 sstrerror (errno, errbuf, sizeof (errbuf)));
142 return (-1);
143 }
145 cs_submit(perfcputotal.pswitch);
146 status = 0;
147 #endif /* defined(HAVE_PERFSTAT) */
149 return status;
150 }
152 void module_register (void)
153 {
154 plugin_register_read ("contextswitch", cs_read);
155 } /* void module_register */