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 <libperfstat.h>
43 #include <sys/protosw.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 value_t values[1];
52 value_list_t vl = VALUE_LIST_INIT;
54 values[0].derive = (derive_t)context_switches;
56 vl.values = values;
57 vl.values_len = 1;
58 sstrncpy(vl.host, hostname_g, sizeof(vl.host));
59 sstrncpy(vl.plugin, "contextswitch", sizeof(vl.plugin));
60 sstrncpy(vl.type, "contextswitch", sizeof(vl.type));
62 plugin_dispatch_values(&vl);
63 }
65 static int cs_read(void) {
66 #if HAVE_SYSCTLBYNAME
67 int value = 0;
68 size_t value_len = sizeof(value);
69 int status;
71 status = sysctlbyname("vm.stats.sys.v_swtch", &value, &value_len,
72 /* new pointer = */ NULL, /* new length = */ 0);
73 if (status != 0) {
74 ERROR("contextswitch plugin: sysctlbyname "
75 "(vm.stats.sys.v_swtch) failed");
76 return (-1);
77 }
79 cs_submit(value);
80 /* #endif HAVE_SYSCTLBYNAME */
82 #elif KERNEL_LINUX
83 FILE *fh;
84 char buffer[64];
85 int numfields;
86 char *fields[3];
87 derive_t result = 0;
88 int status = -2;
90 fh = fopen("/proc/stat", "r");
91 if (fh == NULL) {
92 ERROR("contextswitch plugin: unable to open /proc/stat: %s",
93 sstrerror(errno, buffer, sizeof(buffer)));
94 return (-1);
95 }
97 while (fgets(buffer, sizeof(buffer), fh) != NULL) {
98 char *endptr;
100 numfields = strsplit(buffer, fields, STATIC_ARRAY_SIZE(fields));
101 if (numfields != 2)
102 continue;
104 if (strcmp("ctxt", fields[0]) != 0)
105 continue;
107 errno = 0;
108 endptr = NULL;
109 result = (derive_t)strtoll(fields[1], &endptr, /* base = */ 10);
110 if ((endptr == fields[1]) || (errno != 0)) {
111 ERROR("contextswitch plugin: Cannot parse ctxt value: %s", fields[1]);
112 status = -1;
113 break;
114 }
116 cs_submit(result);
117 status = 0;
118 break;
119 }
120 fclose(fh);
122 if (status == -2)
123 ERROR("contextswitch plugin: Unable to find context switch value.");
124 /* #endif KERNEL_LINUX */
126 #elif HAVE_PERFSTAT
127 int status = 0;
128 perfstat_cpu_total_t perfcputotal;
130 status =
131 perfstat_cpu_total(NULL, &perfcputotal, sizeof(perfstat_cpu_total_t), 1);
132 if (status < 0) {
133 char errbuf[1024];
134 ERROR("contextswitch plugin: perfstat_cpu_total: %s",
135 sstrerror(errno, errbuf, sizeof(errbuf)));
136 return (-1);
137 }
139 cs_submit(perfcputotal.pswitch);
140 status = 0;
141 #endif /* defined(HAVE_PERFSTAT) */
143 return status;
144 }
146 void module_register(void) {
147 plugin_register_read("contextswitch", cs_read);
148 } /* void module_register */